____________ united effort is needed if the problem of the "underground economy"

游客2024-08-14 10

问题 ____________ united effort is needed if the problem of the "underground economy" is to be resolved.

选项 A、There is a
B、It is a
C、Because a
D、An
E、A

答案 E

解析句意：要想解决“地下经济”问题，需要联合努力。前一句是主句，并且已有be动词is，排除ABC。united第一个音不是元音，所以排除D,故选E。

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