19は③で21は①なんですけど、この二つの違いを教えてください😿お願いします

X 19. We ( ) tennis for an hour or so when you turned up. ①have been playing ③ had been playing 2 are playing were playing ) over two hundred miles. xx 20. By the time we get to Birmingham we ( 1 drive 2 have driven ③③ are driving 4 will have driven x 21. I ( ) in Paris for five years when I was a child. 1 lived 2 live 3 have lived 4 had lived

国語力の問題です。④でも文が通じると思うのですが、 答えは②です。

We all knew that there was nothing we could do to prevent him from leaving our team. ( ), we could not help asking him not to. 1 Moreover G 4 2 Nevertheless 3 Specifically Therefore (***

数3合成関数の問題です。解説の青線より上まではできたのですが、青線より下が解説を読んでも分からないので教えてください。

(-1≤x≤1) f(x)={\|x|−1 (x<−1, 1<x)' 9(x)={; x²-1 (x<0) x-1 (0≤x) (gof)(-3), (fog)(-3), (gof)(x), (fog)(x) **£. であるとき,

解説読んでも理解することができませんでした。 どなたか説明お願いします🙇🏻‍♀️‪‪

V C D E G3 FO B A 81 (1)=58' A=18 701 (10+103=15:30 VD: VB-DE: RC TO 10 (3)VDDR=VE:ECE) 12:15=8 (S) 30 VD: VB=VE: VO 11: 83-8: M I (3)VD:VB=DEBC 右の図で、四角形ABCD は正方形で, △BCE は正三角形である。 辺BEと対角線 □ACの交点をF, 辺 CD と線分AE の延長との交点をGとする。 (このとき, △ABF∽△CAGであることを証明しなさい。

同格のthatと関係代名詞のthatのちがいってなんですか？

高一英語 誤り指摘問題 わかる方教えて欲しいです。

As Southern California is such a vast geographical area, it would demand weeks イ of nonstop sightseeing to experience which it offers. ハ = +

高一英語 誤り指摘問題 わかる方教えて欲しいです。

Originally a protest against conventional painting, the Romantic movement had イ a great influence for the art of its time. ハ == D

2つのかっこに共通する単語を答える問題です。わかる方お願いします。

unaffected by a particular disease because of either preventive measures or inherent resistance: The vaccine made them (i) to the disease for life. protected from punishment or legal action due to special status or privilege: The ambassador was (i) from prosecution under international law.

2つのかっこに共通する単語を答える問題です。わかる方お願いします。

extremely important or essential for the existence of something: Education is (v) for personal and professional growth. linked with life or important in keeping a person alive: The patient's (y_) signs were monitored closely during surgery.

2つのかっこに共通する単語を答える問題です。わかる方お願いします。

the branch of science dealing with motion: Classical (m_) is a required course for physics majors. the operational details of something: Biologists study the (m_) of the human body.