【2010湖北•荆州】24. —Why didn’t Betty come to school yesterday?
—_________ she was ill.
A．But B．Though C．If D．Because
答案：D
【解析】考查连词。上文用why作回答，下文用because作应答。
【2010黑龙江·鸡西】29. Usually, we don’t know how important something is ______ we lose it.
A. or B. until C. as soon as
答案：B
