Question

You are sure to fail the test _________ you spend more time doing something helpful.

A．because	B．but
C．when	D．unless

Answer 1

D

解析试题分析：除非你多花些时间做一些有用的事情，否则你一定会考试失败。A. because“因为”；B. but“但是”；C. when“当……时候”；D. unless“除非”。结合句意，故选D。
考点：考查连词辨析。