attempts, attempt, attempting, in, on, at All their _______ to rescue the child from the burning building were _______vain.

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问题 attempts, attempt, attempting, in, on, at
All their _______ to rescue the child from the burning building were _______vain.

选项

答案attempts,in

解析 译文:他们营救困在失火大楼中的孩子的所有尝试都失败了。第一空由all和their可知,“尝试”并不只是一种,故attempt应用复数;第二空表示“白费”用in vain,是固定搭配。答案为attempts,in。
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