问题
选择题
That was a very busy street that I was never allowed to cross accompanied by an adult.
A．when
B．if
C．unless
D．where
答案
答案：C
本题考查连词的用法。when当……时候；if如果；unless除非；where在……地方。句意：那是一条非常繁忙的大街，除非有成年人陪同我是不容许穿越的。
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