Revision of Unit 3-4
一、单项选择1.What ______ you ______ when your teacher came to the classroom?was,doing B. were, doing C. did, do D. did, doing2. He______ the tree when the cat________ down.was climbing, jumping B. was climbing, was jumpingC. was climbing, jumped D. climbed, jumped3. ______ the barber was cutting hair, the alien got out of the UFO. A. While B. When C. Where D. Which4. The woman couldn’t see her son ________. She’s very worried. A. anywhere ...


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