The group of students went to the suburb, did some research work, and ________ the water in the rive

题目简介

The group of students went to the suburb, did some research work, and ________ the water in the rive

题目详情

The group of students went to the suburb, did some research work, and ________ the water
in the river    to see if it had been polluted.
[      ]
A. proved          
B. boiled          
C. tested          
D. exchanged
题型:单选题难度:中档来源:同步题

答案

C

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