The argument remains extremely heatedit is necessary to frequently update teaching materia

发布时间：2020-08-16 16:53:33

The argument remains extremely heated    it is necessary to frequently update teaching material.
A. that
B. which
C. if
D. whether

网友回答

A. that
B. which
C. if
(答案→)D. whether
解析：考查同位语从句。根据the argument和it is necessary to frequently update teaching material为同一内容可判断使用同位语从句并且表示不确定之意，因此使用whether。
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