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It is thought _of seasonal variation is the change in the wi

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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?谢谢您帮忙
It is thought _of seasonal variation is the change in the wi
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...
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