题目内容
Your mom must be ________ about you．
A．worried
B．worry
C．worrying
— Mom, must I finish my homework now?
— No, you ______. You may have supper first.
A. mustn’t B. needn’t C. can’t
－Mom, must I clean my room now?
－No, you . You can do it tomorrow.
A. can’t B. needn’t C. mustn’t D. shouldn’t
