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    【題目】I have ________(keep)the books for three weeks, so I have to return them this afternoon.

    【答案】kept

    【解析】

    句意為:這些書我借了三周了,因此我必須今天下午歸還。根據(jù)時(shí)間狀語for three weeks及空前的have可知,主句謂語動(dòng)詞使用現(xiàn)在完成時(shí),空處需用過去分詞。故填kept。

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