题目内容
He forgot ________ the door, so he went back .
[ ]
| A.locking | B.to lock |
| C.having locked | D.to have locked |
答案:B
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题目内容
He forgot ________ the door, so he went back .
[ ]
| A.locking | B.to lock |
| C.having locked | D.to have locked |