We must do what we can to ____________the river ______________.
#68880
A
protect; against polluting
B
stop; polluting
C
keep; being polluted
D
prevent; from being polluted
推荐题目
 Tell me about it ---don’t _____ anything ______!
#73914
A
hold; back
B
hold; on
C
hold; up
D
hold; out
He__________from his seat and answered the question__________by the teacher.
#71554
A
raised; rose
B
raised; risen
C
rose; raised
D
risen; raised