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The first-place winner at the Annual Geo-Science Fair built a machine to demonst
The first-place winner at the Annual Geo-Science Fair built a machine to demonst
游客
2025-06-12
19
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问题
The first-place winner at the Annual Geo-Science Fair built a machine to demonstrate______earthquakes are caused.
选项
A、about
B、how
C、which
D、over
答案
B
解析
空格处所填词引导的是包含主语earthquakes和谓语are caused的从句,故可以引导从句的连接词(B)和(C)为备选答案。空格所在的从句“——earthquakes are caused”是充当demonstrate(演示)的宾语的名词性从句,根据上下文语义,此处应意为“演示地震如何发生”,因此名词性从句的连接词(B)how(如何)为正确答案。若使用疑问词(C)which,则意思变成“演示发生哪种地震”,语义上显然不通。介词(A)和(D)不能引导从句,后面只能接名词。
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