一道英语选择题,--Someone is knocking at the door.--Yes,it _____be Tim .I saw him outside from the window just now.A.could B.must C.may请给出答案并详细说明理由,thanks very much!

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一道英语选择题,--Someone is knocking at the door.--Yes,it _____be Tim .I saw him outside from the window just now.A.could B.must C.may请给出答案并详细说明理由,thanks very much!
一道英语选择题,
--Someone is knocking at the door.
--Yes,it _____be Tim .I saw him outside from the window just now.
A.could B.must C.may
请给出答案并详细说明理由,thanks very much!

一道英语选择题,--Someone is knocking at the door.--Yes,it _____be Tim .I saw him outside from the window just now.A.could B.must C.may请给出答案并详细说明理由,thanks very much!
根据问题的回答Yes,it _____be Tim .后的I saw him outside from the window just now这句
可以看出,回答者看到了Tim,所以应该是一种肯定的语气,所以选B must

B。must 表肯定推测。。

答案:B
解释:
--有人在敲门。
--是的,那肯定是Tim.我刚才透过窗户看见他在外面了。
根据原因可以知道他能肯定敲门的是Tim.表肯定用must.

B
翻译;有人在敲门。
一定是Tim。我刚才在窗外看见他。
could 和may表示可能,由语境看来是一定,所以用must .
如果你问我为什么由语境看来是一定,我也只能说因为“我刚才在窗外看见他”了。

I saw him outside from the window just now这句
可以看出,回答者看到了Tim,所以应该是一种肯定的语气,所以选B must
may表示一般的推测 不是很肯定 could在此处不是很合适

B
A.could表示 可能是
B.must表示一定是
C.may表示可能是
从后面的句子:我刚才从窗户看见他在外面