专四
A．catch up
B．clear up
C．make up
D．pick up
【解析】动词词组的含义。catch up on“赶做(应及时完成的工作)”，如：I have to catch up on my work tonight，so I can't come out．(今天晚上我得赶工作，不能出来了。)因此A为正确选项。8和C都不与on搭配．而D项pick up与on搭配，为美国俚语，“与……熟悉起来”，不符合题意。
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