单项选择题

While doing calculation for the project, the designers () a new solution to a geological problem.

A. fell into
B. stumbled upon
C. set out
D. discovered

<上一题 目录 下一题>
热门 试题

单项选择题
I meant () you about it, but I forgot to do so.

A. telling
B. having told
C. to tell
D. to have told
单项选择题
The matter is not to be ().

A. watched for
B. waited on
C. taken over
D. trifled with
相关试题