—IsTominthenextroom?  —Well,it’shardtosay.ButIheardhim_...

問題詳情：

— Is Tom in the next room?

   — Well, it’s hard to say. But I heard him _______ loudly when I passed by just now.

    A. speak              B. to speak           C. speaking

【回答】

C

知識點：動詞和動詞短語

題型：選擇題