情态动词专项练习 1. Jean have kept his promise. I wonder why he changed his idea.A. mustB. shouldC. needD. 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; couldB. might; couldC. should; couldD. 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 beB. had toC. would beD. should ha
