I won’t call you, ________ something unexpected happens.
A．unlessB．whetherC．becauseD．while
A
unless引導(dǎo)條件狀語從句,意為“除非”,表示“我不會給你打電話，除非出乎意料的事發(fā)生”。whether引導(dǎo)讓步狀語從句或名詞性從句,意為“無論是否”或“是否”。because引導(dǎo)原因狀語從句,意為“因為”。while引導(dǎo)時間狀語從句,意為“當……的時候”，也可引導(dǎo)并列句,意為“而”。
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