成人英语三级

单选题 This is the reason __________ an aeroplane can´t fly in space．

A．which
B．why
C．where
D．for that

参考答案：B进入在线模考
【参考译文】这就是飞机不能在太空飞的原因。
【答案解析】本题考查定语从句关系副词的用法。先行词为reason，why在从句中作状语。

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