Not everyone has realized what_______ important part the balance of________ nature plays in their life.
| A．an；the | B．/；the | C．an；/ | D．the；/ |
_____ the poem a second time, the meaning will become clearer to you.
| A．Our having read | B．When you read | C．While reading | D．If reading |
The question _____ at tomorrow’s meeting is of great importance.
| A．to discuss | B．being discussed | C．discussed | D．to be discussed |
Not until she arrived home _____ that her wallet had been stolen.
| A．did she find | B．she found | C．would she fi nd |
D．that she found |
—Hi, Tom, Any idea where Jane is?
— She __ in the classroom. I saw her there just now.
| A．shall be | B．should have been | C．must be | D．might have been |
He’s got himself into a dangerous situation _____ he is likely to lose control over the plane.
| A．which | B．that | C．where | D．why |