单项选择题

The road is wet. It ______ last night.

A. should have rained
B. must have rained
C. could have rained
D. must rain
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He speaks as if ______ a native speaker of English.
A. were
B. was
C. has been
D. had been
单项选择题
Only in this way ______ this difficult math problem.
A. we can solve
B. can we solve
C. do we solve
D. we will solve
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