By the end of last year they______1 000 machines.A、turned outB、had turned outC

游客2024-06-20 20

问题 By the end of last year they______1 000 machines.

选项 A、turned out
B、had turned out
C、would turn out
D、had been turned out

答案 B

解析本题考查过去完成时的用法。句中时间状语是by the end of last year。时间状语如果是“by+过去时间”，谓语动词时态用过去完成时；如果是“by+将来时间”，谓语动词时态用将来完成时。the end of last year是“去年年底”，是过去时间，因此选B。

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