外研版英语(刘兆义主编)六年级上册 Unit 4 Accidents 课时练习一、单选题1.Did Mike have ______ accident when he was eight?( ) A. a B. an C. the2.He broke _______ right arm. ( ) A. he B. him C. his3.Here _______ your key. ( ) A. am B. are C. is4.Let's ______ here for a while. (...