题目内容
Please knock ________ the door before you come in.A. in B. of C. for D. at
答案:D
提示:
提示:
| “knock at” 为固定搭配。
|
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题目内容
Please knock ________ the door before you come in.A. in B. of C. for D. at
| “knock at” 为固定搭配。
|