单项选择题

He does not know ______ to deal with the matter and is very worried.

A. what
B. that
C. how
D. as
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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
单项选择题
He speaks as if ______ a native speaker of English.
A. were
B. was
C. has been
D. had been
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