It is thought______of seasonal variation is the change in the wind patterns of t

游客2024-01-02  23

问题 It is thought______of seasonal variation is the change in the wind patterns of the Northern and Southern Hemispheres.

选项 A、what the principal cause
B、of the principal cause
C、that the principal cause
D、the principal cause is

答案 C

解析 The sentence needs noun structure as its subject. It is the false subject. That the principal cause is the beginning of a noun clause.
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