Tom ______the USA. He ________back in two months.A. has gone to; comes B. has gone to; will beC. has been to; comes D. has been to; will be
She was lying in the sofa ____a book.
We must have the machine ____.
He didn’t enjoy the play because he ____.
The dog ____ mad(疯的).
I think _____necessary(必要的) to learn English well.