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Since we ____ for almost two weeks, I’ll need to buy a large backpack in advance to carry my supplies of food and water.

A．have walkedB．will be walking
C．have been walkingD．walked

B

解析試題分析:句意：既然我們要步行幾乎兩周的時間，我將需要提前買一個大的背包來裝食物，水等。根據(jù)后句的時態(tài)可以判斷walk是發(fā)生在將來的動作，應(yīng)該用將來時，故答案選B。
考點(diǎn)：考查動詞時態(tài)。

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