单选题
No one can be sure if the cars on display fit him or her until he or she ______ them.
A、
tries
B、
will try
C、
are trying
D、
have tried
【正确答案】
A
【答案解析】
[解析] 本题测试动词的时态。在时间状语从句和条件状语从句中要用一般时表示将来的动作。因此A是正确答案。例如：They will go home for winter vocation as soon as they finish their exams. (他们一考完试就回家过寒假。)
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