单项选择题
“Must we start the experiment now?” “No, you （）.”
A.won’t B.needn’t C.can’t D.may not
单项选择题 He keeps（）at himself in the mirror.
单项选择题 Don't disturb me. I（）letters all morning and have written ten so far.
单项选择题 I’ve come to ask him for the book. That’s why I （） wait until he comes back.
