Hearingthestepsoftheirteacheronthefloor,thestudentspre...

問題詳情：

 Hearing the steps of their teacher on the floor, the students pretended _______ something attentively.

A. having read    B. reading     C. to reading     D. to be reading

【回答】

D

知識點：非謂語動詞

題型：選擇題