单项选择题
A.won’t B.needn’t C.can’t D.may not
He keeps（）at himself in the mirror.A.to look B.lookin...
单项选择题He keeps（）at himself in the mirror.
A.to look B.looking C.look D.looked
Don't disturb me. I（）letters all morning and have writt...
单项选择题Don't disturb me. I（）letters all morning and have written ten so far.
A.write B.have written C.was writing D.have been writing
I’ve come to ask him for the book. That’s why I （） wait...
单项选择题I’ve come to ask him for the book. That’s why I （） wait until he comes back.
A.need B.should C.oughtto D.have to
