While every possible means __________ to prevent the river pollution, the river in my hometown has still not been restored to its past beauty.
#100447
A
is tried
B
are tried
C
has been tried
D
have been tried
推荐题目
By the time you get to the airport, I ______ for you at the gate.
#100025
A
will have waited
B
will have been waiting
C
will be waiting
D
am waiting
When I said someone cheated in the English exam, I ______ you.
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A
wasn’t referring to
B
had referred to
C
hasn’t referred to
D
will refer to
It i s the second time that the poor area_______.
#101272
A
had been visited
B
has been visited
C
was visited
D
is visited
I first met John at my sister’s wedding. He _________ with the bridegroom at the time.
#100052
A
was talking
B
talked
C
had talked
D
had been talking
Be careful，for the delicate glass ________ easily.
#99442
A
is broken
B
breaks
C
will break
D
has broken