【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)時間狀語for three weeks及空前的have可知,主句謂語動詞使用現(xiàn)在完成時,空處需用過去分詞。故填kept

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