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What can we students do _____ the environment?
#50177
A
to protect
B
protected
C
protecting
D
protects
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推荐题目
 The workers were made ______ twelve hours a day.
#49956
A
work
B
to work
C
worked
D
working
Don’t forget_____your notebook here next Monday.
#50085
A
bringing
B
to bring
C
bring
D
to take
Thank you for_______ me with my English.
#49078
A
help
B
helping
C
to help
D
helps
 My mother has had the clothes _______already．
#49898
A
was washed
B
was washing
C
to wash
D
washed
—What should I do ,doctor?— ___healthy, you should take more exercise.
#50801
A
To keep
B
Keep
C
Keeping
D
Kept