There is a natural phenomenon scientists call the greenhouse effect.A. thatB. whatC. for w

发布时间：2020-08-16 21:11:01

There is a natural phenomenon      scientists call the greenhouse effect.
A. that
B. what
C. for which
D. who

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(答案→)A. that
B. what
C. for which
D. who
解析：考查定语从句。That 指代先行词phenomenon，在句中做call的宾语，call后面接双宾语。句意：有一个科学家称之为温室效应的自然现象。
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