2. 外语
  3. He must have heard of the bad news,______can be perceived in his expression.

He must have heard of the bad news,______can be perceived in his expression.

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问题 He must have heard of the bad news,______can be perceived in his expression.
选项 A、as
B、what
C、while
D、that
答案A
解析 as在这里作关系代词，引导非限定性定语从句，说明前面整句话，符合题意，故选A。
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