The scientists recommend that studies ________ to find out what side effects the medicine might cause.

A．be done B．should do

C．will be done D．a(chǎn)re done

 

A

【解析】A　[recommend后接賓語從句時，謂語動詞用虛擬語氣，should可以省略。此題中因為studies是動作的承受者，所以用被動形式。]

 

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