单项选择题

It was now clear that no such weapons were manufactured and none been found. ()

A. was found
B. were founded
C. has been found
D. have been founded

<上一题目录下一题>

热门试题

单项选择题

Ideally, anatomical investigation consists of a combination of descriptive and experimental approaches. Present-day anatomy involves scrutiny of the structure of organ-isms at many levels of observation.()

A. analysis
B. recognition
C. evaluation
D. examination

单项选择题

Careful testing is necessary before any more experiments can continue with the exploring submarine.

A. needful
B. in need of
C. necessity
D. of necessity

相关试题