．______ the satellite launch drawing near, the research workers put their hearts to the test and always stayed up late.                                         
A．AsB．BecauseC．WithD．While
C
考查with的復(fù)合結(jié)構(gòu)。隨著衛(wèi)星發(fā)射日期的臨近研究人員全力以赴進行測試而且總是熬夜很晚。
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