He was puzzled by this phenomenon. He began to try every approach _________ the best way of working it out.
#96968
A
known to find
B
knowing to find
C
known finding
D
knowing finding
推荐题目
It's known to all that large quantities of TV and Radio programs in China were produced_________ people’s concern over edible oil last year.
#90847
A
to raise
B
raising
C
raised
D
having raised
_____many times, they succeeded _________ the experiment.
#96579
A
Having tried; in doing
B
Tried; in being done
C
Having tried; to do
D
Tried; doing
Every year, Tom remembers to have some flowers ______to her mother on her birthday.
#92776
A
send
B
sent
C
sending
D
to send
Upon arriving home, I was surprised to find the paper I had had _____ was missing.
#96327
A
to be prepared
B
to prepare
C
preparing
D
prepared
The missing boys were last seen _____ near the river.
#97976
A
playing
B
to be playing
C
play
D
to play