Adding extra passengers Acause a boat to settle more Bdeeply in the water, but the boat must not Cbe so loaded that the watermar

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问题 Adding extra passengers Acause a boat to settle more Bdeeply in the water, but the boat must not Cbe so loaded that the watermarks on its side Dgo below the water’s surface.

选项 A、 
B、 
C、 
D、 

答案A

解析 Cause is a plural verb. The uncountable subject adding extra passengers needs a singular verb. Correction: causes.
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