has been said before, it is not easy to learn a foreign language.A. AsB. ItC. WhatD. As it

发布时间：2020-08-14 23:23:38

    has been said before, it is not easy to learn a foreign language.
A. As
B. It
C. What
D. As it

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(答案→)A. As
B. It
C. What
D. As it
解析：as表“正如”，引导非限制性定语从句，代替后面整个主句的意思。
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