用情态动词或否定形式填空1、He ---be at home now ,because he called me from the office just now

问题描述:

用情态动词或否定形式填空1、He ---be at home now ,because he called me from the office just now
2、It ---be dangerous to smoke at the gas station.
3、He ------be the best student in his class ,for he never words hard .But if he words hard,he ----be .

can't (根本不可能)
2.must(肯定)
3.can't (根本不可能).may/might(有可能)