情态动词专项练习1. Jean have kept his promise. I wonder why he changed his idea. A. must B. should C. need D. would 解析：选B. “should have +过去分词” 表示“过去本来应该(但没能)做某事”； keep ones promise 意为“信守诺言”。 2. Jane have come to the party, but she not find the exact time. A. could; could B. might; could C. should; could D. should; would 解析：选A.“ could have+过去分词表示过去本来应该(但没能)做某事”。 3. So many mistakes in your homework! You more careful. A. may be B. had to C. would be D. should have been 解析：选D.
