—Whendidthemeetingbegin?—Sh!Atfouro’clock.It

問題詳情：

 —When did the meeting begin?

—Sh! At four o’clock. It ______ for 15 minutes.

A.  was on           C. began                C. has been on              D. has begun

【回答】

C

知識點：動詞時態

題型：選擇題