Experiments suggest that season of birth dramatically affects the speed______the

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问题 Experiments suggest that season of birth dramatically affects the speed______the body clock ticks.

选项 A、at which
B、for which
C、on which
D、in which

答案 A

解析介词+which引导定语从句时，介词要与前面的名词搭配。本题中定语从句的先行词为speed，at speed意为“高速地”。句意：实验表明，出生的季节极大地影响了人体生物钟运转的速度。故选A。

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