English Junior High over 5 yearsago

3-bの問題で、答えが、waving her hand なのですが、with her hand wavingはダメなのでしょうか？ どなたか教えてください＜(_ _)＞

Theard the phone ring. ・ he started the cngine. Ing her hand at that ime. by She said goodbye の 」Choose the appropriate