Question

【题目】— Many drugs have been forbidden recently.

— Actually. But the scientists say that before a new drug ___ on humans, plenty of studies___.

A. can be tested; are needed

B. can test; are needed

C. can be tested; need

D. can test; need

Answer 1

【答案】A

【解析】

试题分析：考查语态。句意：---最近许多药物都已经被禁用了。----真的。但是科学家们说一种新药能够在人的身上试用之前，需要大量的研究。根据drug是test的动作承受者，studies是need的动作承受者，应该用被动语态。根据题意可知选A项。