【題目】Planting trees _______ protecting our environment.
A.are good for
B.is good to
C.are good at
D.is good for

【答案】D
【解析】句意：種樹對保護我們的環(huán)境有益。be good for對……有益；be good to對……友好；be good at擅長……。主語是動詞-ing形式，謂語用單數(shù)。故選D。

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