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

游客2023-10-17 57

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/3106578.html

相关试题推荐

随机试题

最新回复(0)

Butfortheirgeneroushelp,theexperiment______completedsoquickly.A、shouldn’