As is required by their employer, the employees ______ finish the project within this month.
A．couldB．shallC．mayD．should
D

試題分析：句意：正如雇主的要求,雇員應(yīng)該在本月內(nèi)完成該項目。四個情態(tài)動詞的含義分別是：A. could能夠， B. shall應(yīng)該，C. may可以，D. should應(yīng)該，從句中用了required，所以主句用should do表示虛擬語氣。選D。
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