【题目】It was ___ that their parents had visited the city.
A.the first time
B.for the first time
C.first time
D.on the first time

【答案】A
【解析】考查固定句型。句意：这是他们的父母第一次参观这座城市。 It is/ was＋the＋序数词＋名词＋从句(从句中的时态要用完成时态；如前为is，则用现在完成时，如为was则用过去完成时)，故选A。