It was not until the 1990s ________ industrial robots became really cheap, and t

游客2023-09-19 15

问题 It was not until the 1990s ________ industrial robots became really cheap, and therefore a possible option.

选项 A、which
B、who
C、whom
D、that

答案 D

解析根据语法，空格处应填入that构成强调句型。故选D。

转载请注明原文地址:https://tihaiku.com/zcyy/3026801.html

相关试题推荐

随机试题

最新回复(0)

______ofthegoodnews,hebecamehappyindeed.A、InformingB、InformedC、KnewD、