牛津初中英语9A Unit6 同步测试 一. 选择题 ( )1. I often hear Mary ________ in her room. A. sing B. singing C. to sing D. sang ( )2. They knocked him down and _________ him of this bag. A. rob B. robbed C. steal D. stole ( )3. He has difficulty with his English, ________, he works hard and is making great progress. A. and B. but C. however D. yet ( )4. Sally doesn’t have to be made ________. She always works hard. A. learn B. to learn C. learned D. learning