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活页练(三十五)单项填空＋完形填空＋阅读理解 Ⅰ.单项填空 1．You can go out，________ you promise to be back before 10 o’clock. A．unless B．as long as C．because D．since 答案 B 解析 unless除非；as long as只要；because因为；since既然，自从。句意为：你可以出去，只要你答应在10点之前回来。 2．Hearing a scream，I rushed downstairs，only ________ the hostess lying unconscious on the floor. A．seeing B．having seen C．seen D．to see 答案 D 解析 only to do表示出乎预料的结果。句意为：听到尖叫声，我冲到楼下，结果发现女主人躺在地板上失去了知觉。 3．Didn’t ________ ever occur to you what the source of this saying I just quoted is? A．this B．it C．that D．one 答案 B 解析 这是一个否定形式的一般疑问句。it作形式主语，代替what the source of this saying I just quoted is。sth.occur to sb.某人突然想起某事。句意为：难道你没有想起来我刚才引用的谚语的出处？ 4．________ rise in carbon dioxide is causing ________ steady increase in global warming. | 
