We_______on this project for four hours. Let’s have a rest.
A．a(chǎn)re workingB．have been workingC．workedD．had worked
B
考察時態(tài)，根據(jù) Let’s have a rest.可知一直都在工作�！拔覀円恢弊鲞@個項(xiàng)目4個小時了，歇歇吧�！贝鸢窧。
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