The machine has been used many years. It’s no wonder that it doesn’t work well________. 
#10744
A
regularly
B
constantly
C
occasionally
D
frequently
推荐题目
.I want to buy a rope which is _____________this one.
#14384
A
twice as longer as
B
as twice long as
C
twice the length of
D
as twice as
As time went by, the plan stuck ______ fairly practical.
#12623
A
to proved
B
to proving
C
proved
D
to be proved