Question

【题目】The girl__________ swim when she was only four years old. Isn't it amazing?
A.could
B.may
C.can
D.must

Answer 1

【答案】A
【解析】句意：这个女孩四岁时就会游泳了。是不是很惊人？结合when引导时间状语从句时，主句时态要一致，推知主句应该使用一般过去时态。根据句意及结构，故选A。