They studied what ______ since 2007 and found Australian electricity prices were among the highest in the developed world.
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A
has happened
B
happened
C
had happened
D
has been happening
推荐题目
In the last twenty years, seven Canadian scientists _____ the Nobel prize!
#100223
A
won
B
had won
C
was winning
D
have won
The teacher, with 6 girls and 8 boys of her class, ________ visiting a museum when the earthquake struck.
#104774
A
was
B
were
C
had been
D
would be
If my father ______here now, he _____ tell me what to do. But he left home just one hour ago.
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A
were, would
B
were, will
C
is , would
D
is, will
Great changes ______ in my school in the past ten years.
#100927
A
took place
B
were taken place
C
have taken place
D
have been taken place