Question

りは

2でも1でもシャワーを浴びていた　になりませんか？

(6) Tetsuya didn't hear the doorbell when his visitors arrived, because he (
4. has taken
1. has been taking
2 was taking
3. took
) a shower.
センター試験

Answer 1

rirakuma

didn't なので、was

Answer 2

n w

なりません

1 has been taking (現在完了進行形)

問題文は 過去 のことが話題なので、because ～ の理由を現在完了進行形だと合わないです