While______an efficiency test on an engine, certain precautions should be observ

游客2024-08-15 61

问题 While______an efficiency test on an engine, certain precautions should be observed.

选项 A、making
B、to make
C、being made
D、made

答案 A

解析

转载请注明原文地址:http://tihaiku.com/zcyy/3721190.html

相关试题推荐

随机试题

最新回复(0)

—______—Itshouldbegood.I’mlookingforwardtotakingit.A、Doyoulikecompu