问题描述：
一道英语题（选择填空）
Please leave __________ 6:00,then you'll be able to get there __________ time.
A、till；in B、after；on C、behind；in D、before；on
Please leave __________ 6:00,then you'll be able to get there __________ time.
A、till；in B、after；on C、behind；in D、before；on
问题解答：
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