Question

这题选什么？急！！！

Many people believe that the technology of genetic engineering should_________.
A. be put to use
B. put to use
C. be put to the use
D. put through use

Answer 1

这题标准答案是A.解析:put sth to use为固定搭配表示把...用到这，
把...投入使用本题使用时被动语态，即sth be put to use故选A

Answer 2

选A.
put to use 投入使用
许多人认为基因工程技术应投入使用

Answer 3

第一，要用被动语态，所以B，D排除
第二，短语用put sth to use, 所以排除了C

答案 A

Answer 4

虚拟语气，选A

Answer 5

选 A

Answer 6

A