. ---The train hasn’t come yet. It is half an hour late. --- Yes. It here at 2:02 as sche

问题补充：

. ---The train hasn’t come yet. It is half an hour late.

--- Yes. It here at 2:02 as scheduled.

A. must have been

B. should be

C. should have been

D. must be

答案：

A. must have been

B. should be

(答案→)C. should have been

D. must be

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