专四

单选题_________填上最佳答案。

A．Therefore 
B．Unfortunately
C．In a word 
D．In comparison

参考答案：B进入在线模考
考查篇章分析能力。it is often the case that…表示”情况通常是……”。其中that是主语从句。it为形式主语。前文说，日班与夜班的转换需要5天到1周来适应，而工业领域常常又是每周换一次班，这是“不幸的”，故选B、所以才有下文“这意味着一个人刚适应了夜班就义要转回白班”。
【点睛】语义线索题。A．Therefore“所以”，C．In a word“总之”．D．In comparison“相比较而畜”，均不合题意。

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