﹣The air here is much fresher than before．
﹣Exactly! We a lot of trees in the past few years．（ ）
A．plantedB．were planting
C．have plantedD．will plant
Mrs.Jones ______________in the garden at this time yesterday.（ ）
| A． |
worked |
B． |
was working |
| C． |
has worked |
D． |
_____it over，and you will be able to work out the problem.（ ）
| A． |
Thinking |
B． |
To think |
C． |
Think |
I like smart clothes ____are made of silk.（ ）
| A． |
who |
B． |
which |
C． |
what |
Please hurry up!The plane will _______________in half an hour.（ ）
| A． |
take up |
B． |
take after |
C． |
take off |
Only at that time ___________that he was wrong.（ ）
| A． |
he realized |
B． |
did he realize |
| C． |
he did realize |
D． |