—That must have been a lot of work.
—Yeah, it ________ us three days to finish it.
A．takes　B．had taken
C．took　D．was taking
C
考查動詞時態(tài)。句意：——你們一定做了許多工作�！堑�，完成這些工作花費了我們?nèi)斓臅r間。根據(jù)“must have been”可知，此處是對過去情況的一種推測，故“花費”這一動作應(yīng)發(fā)生在過去，所以用一般過去時。
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