Question

【题目】The water dark and dirty. It's no longer safe to drink.
A.became
B.has become
C.will become
D.was becoming

Answer 1

【答案】B
【解析】考查动词时态。句意：水变得又脏又黑，已经不能继续安全饮用了。根据It's no longer safe to drink.可知，给现在带来的结果是不能饮用了，所以用现在完成时，表示过去的动作对现在的影响，故选B。