Question

【题目】They usually have the medicine __________ before putting into the market all over the country.

A. testing out

B. to be tested out

C. being tested out

D. tested out

Answer 1

【答案】D

【解析】句意：在投放全国市场之前他们通常要对药物进行试验。考查“have+宾语+宾语补足语”结构，the medicine与testout 之间是逻辑上的动宾关系，同时根据usually可知,此处表示一般现在时，故选用D项。