题目内容

The scientists recommend that studies ________ to find out what side effects the medicine might cause.
A．be doneB．should do
C．will be doneD．are done
A
A　[recommend后接宾语从句时，谓语动词用虚拟语气，should可以省略。此题中因为studies是动作的承受者，所以用被动形式。]
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