每天练习 英语练习

However, at times this balance in nature is (  ), resulting in a number of possibly unforeseen effects.

A troubled             B confused           C disturbed          D puzzled

上期答案

Criticism and self-criticism is necessary (  ) it helps us to find and correct our mistakes.

A by that             B in that               C on that           D at that

本题大意：批评与自我批评是必要的，因为它可以帮助我们发现并改正错误。

一般that引导的从句不作介词宾语，但besides that , but that , except that , in that除外。