单项选择题

A.race
B.pace
C.speed
D.step
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单项选择题
A.live up toB.catch up onC.put up withD.keep up with
A.live up to
B.catch up on
C.put up with
D.keep up with
单项选择题
A.He lost a button at work.B.He doesn’t know where he put the calculator.C.He thinks he broke something the woman lent him.D.He’s not sure how to solve the math problem.
A.He lost a button at work.
B.He doesn’t know where he put the calculator.
C.He thinks he broke something the woman lent him.
D.He’s not sure how to solve the math problem.
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