What? Is it the first time that this _________?
A．happenedB．has happened C．had happenedD．happens
B

試題分析：本題的固定句式為：It/This is/was the序數(shù)詞 time that從句，句意：是某人第幾次做某事的時候了。如果前面是is，后面就使用現(xiàn)在完成時；如果前面是was，后面就是過去完成時。本句中使用了is說明后面使用現(xiàn)在完成時。句義：什么？這是第一次發(fā)生這樣的事情？根據(jù)句義說明B正確。
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