单选题_____AthoughBwhetherCasDif

单选题
_____
A

though

B

whether

C

as

D

if


参考解析

解析:
as此处意为“正如,像”。as可作关系代词,引导非限制性定语从句,指代整个主句,主句前后都可放。if,though,whether都是连词,不符合题意。

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