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  3. The drug is reported__________many trials before it was put into the market.

The drug is reported__________many trials before it was put into the market.

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问题 The drug is reported__________many trials before it was put into the market.
选项 A、to be given
B、to have been given
C、to give
D、to have given
答案B
解析 “sb. /sth. is/was said/ announced/ reported…to do”是固定句型，意为“据说/据宣布/据报道某人某事……”。drug 与give之间是逻辑上的动宾关系，所以应用不定式的被动形式。又因为give所表示的动作发生在is reported之前，所以应用不定式的完成被动式，即“to have been+过去分词”的形式。故选B。
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