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【題目】Jack had planned to visit his grandparents last weekend, but an emergency _____ and he had to reschedule.

A.should come upB.had come upC.came upD.would come up

【答案】C

【解析】

考查時態(tài)。句意:杰克原計劃上周末去看望他的祖父母,但突然發(fā)生了一件緊急事情,他不得不重新安排時間。由“he had to reschedule”可知,and連接的兩個句子都為一般過去時。故選C項。

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