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B1U2 Ⅱ.重点句型详解 1．While walking the dog, you were careless and it got loose and was hit by a car.While walking the dog＝While you were walking the dog，。when, while, if, as if, though, as, where, unless等连词(词组)引导的状语从句中，be，it时，be常常省略。 在日本时，我拍了许多漂亮的照片。 ②While (I was) waiting, I read newspapers. 我边等待，边看报纸。 ③If (it were) not for you, we would not go there. 要不是为你，我们就不会去那儿了。 ④He looks as if (he were) drunk.他看上去像喝醉了。 ⑤She went on working though (she was) exhausted. 尽管她精疲力竭，但仍继续工作。 ⑥Fill in the blanks with the given words; change the form where (it is) necessary.用所给词填空，必要的地方改变形式。 ⑦I won't go unless (I'm) invited. 除非被邀请，否则我不会去。 [即境活用1] When first ______ to the market, these products enjoyed great success. A．introducing B．introduced C．introduce Dbeing introduced 解析：将从句补全应为When these products were first introduced to the market，主从句主语一致且从句中有be，可以省略主语和be。 | 
