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

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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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