单项选择题

No one would have time to read or listen to an account of everything ______ going on in the world.

A. it is
B. which is
C. that is
D. what is
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单项选择题
To achieve his heart's desire, he is racing the clock all the time. He is not the man ______ he was two years ago.
A. which
B. that
C. who
D. whom
单项选择题
Unless ______ by credit card, please pay in cash.
A. pay
B. is paid
C. paying
D. paid
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