It is thought _of seasonal variation is the change in the wind patterns of the Northern Hemisphere.(A) what the principal cause (B) of the principal cause (C) that the principal cause (D) the principal cause is答案及解析,请问这是什么从句

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It is thought _of seasonal variation is the change in the wind patterns of the Northern Hemisphere.(A) what the principal cause (B) of the principal cause (C) that the principal cause (D) the principal cause is答案及解析,请问这是什么从句

It is thought _of seasonal variation is the change in the wind patterns of the Northern Hemisphere.(A) what the principal cause (B) of the principal cause (C) that the principal cause (D) the principal cause is答案及解析,请问这是什么从句
It is thought _of seasonal variation is the change in the wind patterns of the Northern Hemisphere.
(A) what the principal cause
(B) of the principal cause
(C) that the principal cause
(D) the principal cause is
答案及解析,请问这是什么从句?谢谢您帮忙

It is thought _of seasonal variation is the change in the wind patterns of the Northern Hemisphere.(A) what the principal cause (B) of the principal cause (C) that the principal cause (D) the principal cause is答案及解析,请问这是什么从句
C
It is thought that...
that引导的是主语从句.that指起连接作用,不作任何成分.
类似的句型很多:
It is said/reported/believed that...
很高兴为你解答!
多谢你的问题!

C。另外,It is。。。 that这个句型现实生活中用的很多,表示强调哈,It is the bad weather that cause our staying at home.

选择C。是一个主语从句。It is thought that 是主语从句的结构。 The principal cause of seasonal variation做主语,is 是谓语。
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