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. test-高中英语-n多题

◎ 题干

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

◎ 答案

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◎ 解析

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◎ 知识点

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