It is necessary _____ something to protect our environment.
#50188
A
do
B
to do
C
does
D
doing
推荐题目
So many kinds of sweets! I really can’t decide _______.
#48578
A
what to buy
B
which to buy
C
to buy which
D
to buy what
--- Is Jim in the gym by himself?--- No. There is another boy ________ tennis with him.
#49973
A
playing
B
play
C
plays
D
to play
——Oh, I had a terrible toothache.——You’d better see a dentist and have your bad teeth out.
#49488
A
to go; pulled
B
go to ; pulling
C
to go; pulling
D
go to; pulled