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
Something _______ wrong with the machine, and it _______ not work.
#103862
A
being; could
B
going; should
C
were; might
D
went; would
We are all ____________ in books these days since the exams are coming.
#99337
A
caught
B
missed
C
stuck
D
buried
— Jim has gone to Britain to see a modern art exhibition. — Oh, really? Do you know when he ?
#99858
A
leaves
B
will leave
C
was leaving
D
left
Ever since middle school, my sister and I ________ about taking a bike trip.
#100065
A
dreamed
B
dream
C
have dreamed
D
had dreamed
—Guess what? I happened to have met Mark at the party last week． —If my memory serves me correctly, you two ______ each other for almost ten years．
#101469
A
hadn't seen
B
haven't seen
C
didn't see
D
don't see