题目内容
—I'm sure they will succeed in the experiment next week.
—I think so. They for it for months.
A.are preparing B.were preparing C.had been preparing D. have been preparing
D
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题目内容
—I'm sure they will succeed in the experiment next week.
—I think so. They for it for months.
A.are preparing B.were preparing C.had been preparing D. have been preparing
D