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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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
单项选择题
I don't think he is very good at English, ______
A. does he
B. doesn't he
C. is he
D. isn't he
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