A freely falling body has an acceleration of 32 feet a second during each second it falls.

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问题 A freely falling body has an acceleration of 32 feet a second during each second it falls.

选项 A、that
B、why
C、which
D、as

答案A

解析 当先行词被all,every,each等词修饰时,关系代词只能用that。
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