By signing the petition, you are______the ban of commercial logging in the nation's forests.
A.support
B.supports
C.supported
D.supporting

A.A.support
B.supports
C.supported

【参考答案】

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......

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