（2016•十堰）- We will fail the exam ______ we study hard.- That's why we are trying our best to prepare for the exam.

题型：单选题题类：常考题难易度：普通

湖北省2017届九年级英语专题练习：连词

- We will fail the exam ______ we study hard.

- That's why we are trying our best to prepare for the exam.

A、until B、when C、unless D、how

举一反三

— Oh, he is very kind ________ he looks very serious.

— She's my cousin.

一It's curly．

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