请从语法角度详解.（2）
问题描述：
请从语法角度详解.（2）
44、She must be in her room,_________?
A.isn’t B.is she C.mustn’t she D.needn’t she
50、By the time I got to the check-out,I realized that I had _______ my purse at my office.
A.forgotten B.left C.laid D.put
51、She was never heard _______ so wrong word ( nice,lovely etc.) before.
A.singing B.sing C.to sing D.sung
答
1. A isn't she
must 的反意疑问句要看其后的动词.这里是 be,She 搭配is,前肯定后就否定.
2. B 过去完成时 had done, 把东西忘在某地应用leave 过去分词left
3. Chear sb. do sb. 变成被动be heard to do