单项选择题

We must study English well, no matter __________ difficult it is.

A．what
B．however
C．how
D．that
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单项选择题
A．Are you free tomorrowB．I like watching TV.C．I agree with you.D．Go ahead.
A．Are you free tomorrow
B．I like watching TV.
C．I agree with you.
D．Go ahead.
单项选择题
__________ either of them taken part in the performance
A．Have
B．Is
C．Has
D．Are
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