______he referred to in his speech, the pollution in Beijing is indeed not serious.

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问题 ______he referred to in his speech, the pollution in Beijing is indeed not serious.

选项 A、What
B、As
C、Which
D、Since

答案B

解析 A仅能引导一般疑问句或名词性从句(包括主语从句、表语从句、宾语从句和同位语从句),不可能出现在定语从句中;B 和C 都可以引导非限制性定语从句,但后者不可能出现在句首,所以排除C。当然出现在句首的情况是在特殊疑问句中,用问号,表示有选择的疑问。选D 句意不通。因此选B。
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