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【单选题】

—I think _______ books and paper is really easy.
—I agree.But it's hard to stop_______ in cars.
[ ]

A.
recycle, riding
B.
recycling, ride
C.
recycle, to ride
D.
recycling, riding
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举一反三

【单选题】—do you eat vegetable?—Every day.[ ]

A.
How long
B.
How often
C.
How many times
D.
How much