In order to keep the balance of ecosystem, every possible means _______to deal with the problems of the over-exploiting of natural resources.
#101293
A
has tried
B
has been tried
C
have taken
D
have been taken
推荐题目
Though we don’t know what was discussed, yet we can feel the topic_____.
#104962
A
had changed
B
will change
C
was changed
D
has been changed
It’s obvious that she ______ him for a long time.
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A
has adored
B
adored
C
is adoring
D
has been adoring.
The central heating system of this office building is down and several workers ______ it right now.
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A
had repaired
B
have repaired
C
repaired
D
are repairing
How can you possibly miss the news? It ________ on TV all day long.
#104771
A
has been
B
had been
C
was
D
will be
—How can I apply for an online course?—Just fill out this form and we _______ what we can do for you.
#104078
A
see
B
are seeing
C
have seen
D
will see