Everyone should make a contribution the environment.
#60222
A
to protect
B
to protecting
C
protects
D
protected
推荐题目
He’ll phone you as soon as he ________ Beijing .
#54912
A
reaches to
B
arrives in
C
will reach
D
will arrive
The little girl preferred hours solving the problem to others’ answer.
#63520
A
to spend; copying
B
spending; copying
C
spending; copy
D
to spend; copy
