[题目]They will lose the game they try their best.A. till B. unless C. since D. if 题目和参考答案——青夏教育精英家教网—

题目内容

【题目】They will lose the game _________ they try their best.

A. till B. unless C. since D. if

【答案】B

【解析】

试题分析：句意：--用英语怎么说？-它是一个橘子。因为orange以元音音素开头的单词所以其前边用不定冠词an，故选B。

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