Ocean currents, Awind and air temperature Bcontributes to rainfall, Cwhich is one of the primary Dfactors of climate.

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问题 Ocean currents, Awind and air temperature Bcontributes to rainfall, Cwhich is one of the primary Dfactors of climate.

选项 A、 
B、 
C、 
D、 

答案B

解析 Contributes is a singular verb. The compound subject ocean currents, wind, and air temperature needs a plural verb. Correction: contribute.
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