B.when
C.since
D.unless
解析:选D 考查状语从句。句意:我认为你应该更努力地工作,除非你对现状满意。根据句意可知,此处用unless引导条件状语从句。unless“除非,除非在……情况下”。
5.________ is known to all is that effective measures should be taken to deal with the problem of the overexploitation of our resources.
A.What
B.It
C.As
D.Which
解析:选A 考查主语从句。分析句子结构可知,空处引导主语从句,且在从句中作主语,所以用what引导。注意区分以下结构:As is known to all, effective measures should be ...,其中As引导非限制性定语从句;It is known to all that effective measures should be ...,其中It为形式主语,真正的主语是that引导的主语从句。
6.—When did you get home last night?
—It was almost midnight ________ we arrived home.
A.that
B.before
C.since
D.when
解析:选D 考查状语从句。句意:“你们昨晚什么时候到家的?”“我们到家的时候差不多是午夜了。”答语中“It was almost midnight”为主句,空处引导时间状语从句,应用连词when。注意:此题容易误选that,误把答语当作强调句型。如果是强调句型,应是It was at midnight that we arrived home。
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