单项选择题

What are they doing They （）a meeting.

A. must have
B. may have
C. might be having
D. could be having

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Five minutes earlier,（） we could have caught the last train.

A. and
B. but
C. or
D. so
单项选择题
（） London of Dickens’ time comes to （） life in his books.

A. The, /
B. /, /
C. /, the
D. The, the
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