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
The form ______in and returned within three weeks.
#98816
A
is to be filled
B
will fill
C
is to fill
D
are going to be filled
The old man came to the railway station，only the train was slowly pulling out of the station．
#95602
A
and ran；found
B
running；finding
C
running；to find
D
to run；to find
After walking on the zigzag path to the mountain top for a few hours, the tourists gathered under trees_____ shade and______ down to have a rest.
#93590
A
provided; sit
B
providing; sitting
C
providing; sat
D
provided; sat
The novel is so interesting that it is worth ________ another time.
#92904
A
of reading
B
to read
C
reading
D
to be read
With a lot of difficult problems_____, the newly-elected president is having a hard time.
#95662
A
settled
B
settling
C
to settle
D
being settling