The reason ______ he did not arrive in America as scheduled was that his flight was called off because of the bad weather.

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问题 The reason ______ he did not arrive in America as scheduled was that his flight was called off because of the bad weather.
定语从句

选项 A、when
B、why
C、which
D、where

答案B

解析 首先可以判断这句是定语从句,先行词reason在从句中作原因状语,因此应该用关系副词why来引导定语从句,故选B。
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