題目列表(包括答案和解析)
--It must be John who is in the office．
--I'm sure it ________ be John．I saw him off at the railway station just twenty minutes ago．
A．won't B．mustn't C．can't D．needn't
－It must be John who is in the office．
－I'm sure it ________ be John．I saw him off at the railway station just twenty minutes ago．
A．won't
B．mustn't
C．can't
D．needn't
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