Two hundred computers (sell) ______ since the beginning of the year.have been so

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问题 Two hundred computers (sell) ______ since the beginning of the year.

选项

答案 have been sold

解析句子意为：自从年初以来，已经卖出去了200台电脑了。本题测试动词时态。since常常和现在完成时态连用。

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