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I'm exhausted; I （）too much work to do these days

A. had
B. having
C. have
D. am having

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Kathy （）to South Korea more than five times

A. have been
B. has went
C. gone
D. has been

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I can't stand my job anymore. （）quit tomorrow morning

A. may
B. have
C. did
D. am going to

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