These diagrams are especially helpful when we have a concrete problem ________ at hand.
#88821
A
be solved
B
to solve
C
solved
D
being solved
推荐题目
____ volcanoes now for many years, I am still amazed at their beauty as well as their potential to cause great damage.
#91442
A
Studied
B
To study
C
Having studied
D
Studying
______ the project in time, the staff are working at weekends.
#90646
A
Competing
B
Having completed
C
Completed
D
To complete
The oceans and seas ______ the islands are more or less polluted.
#91842
A
surrounding
B
surrounded
C
are surrounded by
D
are surrounding
Little Jim should love _____to the theatre this evening.
#98361
A
to be taken
B
to take
C
being taken
D
taking