The argument remains extremely heatedthere are necessary conditions of existence such as w

发布时间：2020-08-15 01:47:50

The argument remains extremely heated    there are necessary conditions of existence such as water on the Mars.
A. that
B. whether
C. if
D. which

网友回答

A. that
(答案→)B. whether
C. if
D. which
解析：whether在此引导同位语从句，不能用if代替。
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