单项选择题

He talks as if he ______ everything.

A．know
B．knew
C．had known
D．has known
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单项选择题
A．Yes, of course.B．How do you doC．The same to you.D．Fine, thank you.
A．Yes, of course.
B．How do you do
C．The same to you.
D．Fine, thank you.
单项选择题
Most of the students failed in the final exam. It ______ easy.
A．can't be
B．shouldn't be
C．mustn't have been
D．couldn't have been
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