17．—Sorry we're late．We ______ the wrong turning．
—That's all right．Come in, please．
| A．take | B．have taken | C．took | D．had taken |
Jack is a great talker. It’s high time that hesomething instead of just talking.
| A．will do | B．has done | C．did | D．do |
With more forests destroyed, huge quantities of good eartheach year.
| A．is washing away | B．is being washed away |
| C．are washing away | D．are being washed away |
How did it that you made such a silly mistake?
| A．bring about | B．come about |
| C．come across | D．come on |
He was told that it would be at least 3 more monthshe could recover and return to work.
| A．until | B．as soon as | C．since | D．before |
When asked to explainhe did to make his students so fascinated with his lessons the teacher paused and thought deeply.
| A．what it was that | B．that what it was |
| C．what was it that | D．that what was it |