A(I recommend) that you all B(are) diligent C(if) you want to pass D(the exam).

admin2012-08-03  25

问题 A(I recommend) that you all B(are) diligent C(if) you want to pass D(the exam).

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答案B

解析 改为be。recommend“推荐,建议”后面要加虚拟语气,即(should)+动词原形。
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