问题

You can’t complain of being left alone ________ you don’t make any effort to meet people.[ ]

A: when
B: while
C: though
D: unless

正确答案是：

同类题型

I ’m sure Andrew will win the first prize in the final—- I think soHefor it for months

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Mrs Black doesn’t believe her son is able to design a digital camera，________？[ ]

What about going skating this afternoon, Sam—I would rather ______ at home than ______ skating on such a cold day.

_________ you start, _________ you’ll finish.