—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

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问题 —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.

选项 A、won’t
B、mustn’t
C、can’t
D、needn’t

答案C

解析由下句的情境可知John不在，应该用否定推测，即can’t。所以选C。

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