We must try our best to the river being polluted any more.
#101113
A
separate
B
keep
C
prevent
D
guard
推荐题目
—Why are you late today．Mary?—I’m sorry，Mr Li．My bike ________ on the way．
#102381
A
broke down
B
has broken down
C
breaks down
D
had broken down
The price of oil is increasing so rapidly.Indeed ! The oil prices____by 10 and 20 percent so far.
#101844
A
increased
B
increase
C
had increased
D
have increased
Miss Gao asked her mother if she _______ to the hospital the day before when she was out.
#103217
A
had gone
B
would go
C
went
D
was going
He will have learned English for eight years by the time he _______ from the university next year．
#99963
A
will graduate
B
will have graduated
C
graduates
D
is to graduate
---What ‘s the matter with you? --- You _____ my heart. - -- But I didn’t mean to hurt you.
#102840
A
broke
B
are breaking
C
had broken
D
have broken