应选B.两点：1,应用被动语态 2,在if引起的状语从句中,即使表示将来也不能用将来时,用一般现在时代替.希望我的回答能使你满意.
I think we'll carry it out if the experiment ___before ten A
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单词改错（ ) Think it over and you'll work out the question,I am