【題目】Trees are very important. We can't .
A.cut it down
B.cut down it
C.cut them down
D.cut down them

【答案】C
【解析】句意：樹木非常重要，我們不能砍伐。前文中的trees為復(fù)數(shù)形式，用代詞them替代；cut down為動(dòng)副詞組，代詞放中間。所以答案是C。

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