When their first tests failed, the engineers at OKM Corporation agreed it was___

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问题 When their first tests failed, the engineers at OKM Corporation agreed it was______to try using different materials.

选项 A、time
B、end
C、moment
D、turn

答案 A

解析 It is time to…“是…的时候了”。其他的选项虽然也可以接to+动词原形，但有以下的错误：(B)end“结束”的前面要加冠词。(C)moment“时机”的前面也要加冠词。(D)turn“轮到”意思不通。

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