My aunt said that she ________ to Guangzhou. A has never gone B.had never gone C.has never been D. had never been
We won’t start the meeting ________ the teacher arrives.
The workers are trying to ________ what’s wrong with the machine.
Internet is ________ used by people, especially by young people.
It’s so fine. Why not ________ outdoors?
The plane from Beijing to Hong Kong ________ half an hour ago.