单项选择题

He must be in the building because he was seen ______ the building just now.

A. entering
B. enter
C. to enter
D. having entered
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单项选择题
I saw Mr. Zhang a moment ago. He ______ to Germany.
A. can't go
B. couldn't have gone
C. mustn't go
D. mustn't have gone
单项选择题
He looks similar to his father. What's more, his words are ______ his father.
A. as few as
B. as little as
C. as less as
D. as fewer as
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