2017年女人剃光头视频:.The teachers do all __ improve their teaching abilities

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A. they can to B. what they can to
选A还是B?为什么?

The teachers do all (that) they can to improve their teaching abilities.

The teachers do what they can to improve their teaching abilities.

A. they can to

do all they can - 尽全力

B里的what 似是重覆了all的意思,所以不适用.

A。

原文的意思是,老师们努力提高教学能力。如果没有all,可以用从句。

A
ALL引导的定语从句要省略WHAT

B,what 代指要做什么