模拟四
( )1. Students can’t get good grades without working hard. (同义替换)
A. if they have no work B. if they study
C. if they don’t study
( )2. The students ought to wear school uniforms when they are at school. (同义替换)
A. are supposed to
B. are allowed to
C. would like to
( )3. No matter what they do, they always do it very carefully. (同义替换)
A. What B. However C. Whatever
