摘要： ---Must I finish my homework now?-- No, you . You may have a rest first. A. mustn’t B. can’t C. may not D. needn’t 89-Why is the man running in the street? --He for exercise. A. might run B. might be C. might be running 90 We were late for class the heavy rain. A. because B. because of C. so 91I didn't come to school yesterday I had to look after my grandmother at home. A. because B. because of C. since

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