By signing the petition, you are______the ban of commercial logging in the nation’s forests.

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问题 By signing the petition, you are______the ban of commercial logging in the nation’s forests.

选项 A、support
B、supports
C、supported
D、supporting

答案D

解析 空格前是be动词(are),所以(A)项和(B)项被排除。空格中可以是过去分词,表示被动,也可是现在分词,表示进行式。这里的主语是you,因此(D)项supporting是正确答案。
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