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7．He had to return to his home in Beijing because his flight ．（　�。�

	A．	had cancelled		B．	has been cancelled
	C．	will be cancelled		D．	had been cancelled

分析他不得不回到北京的家，因為他的航班被取消．

解答答案是D．本題考查過去完成時的被動語態(tài)；過去完成時強調(diào)"過去的過去"，強調(diào)動作發(fā)生在過去某一時間或動作之前；本題中had to return是過去，cancel發(fā)生在had to return之前，所以是"過去的過去"，并且航班是"被取消"，故需要過去完成時的被動語態(tài)，答案選D．

點評對時態(tài)的選擇，要在把握時態(tài)的基本用法的基礎上，根據(jù)具體語境和題干中的時間推斷時態(tài)，同時關注特殊的結(jié)構(gòu)．

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