The guide wheels of a roller coaster are used for______on straight-aways and hil

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问题 The guide wheels of a roller coaster are used for______on straight-aways and hills.

选项 A、as gliding
B、to glide
C、gliding
D、glided

答案 C

解析 The sentence needs a noun structure as the object of the preposition for. The answer, gliding, is a gerund.

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