It is necessary _____ something to protect our environment.
#50188
A
do
B
to do
C
does
D
doing
推荐题目
We are looking forward ____________ a film next week.
#49721
A
to see
B
to seeing
C
for seeing
D
seeing
What’s the best way        a  foreign language ?
#49559
A
learn
B
learning
C
to learn
D
learns
______ on real ice is very exciting.
#51294
A
Skate
B
Skates
C
Skated
D
Skating
Jack had a wonderful time _____ many interesting places in Beijing and he had        much time __________ the city.
#50019
A
to visit; to enjoy
B
to visit; enjoying
C
visiting; to enjoy
D
visiting; enjoying