They studied what ______ since 2007 and found Australian electricity prices were among the highest in the developed world.
#102193
A
has happened
B
happened
C
had happened
D
has been happening
推荐题目
I wasn’t aware of this before, but recent research _____ that eating too much fat can contribute to heart disease.
#102842
A
has shown
B
will show
C
was showing
D
showed
---- I hear that Jason is planning to buy a car.---- I know. By next month, he _ enough for a used one.
#101431
A
will have saved
B
will be saving
C
has saved
D
saves
By the time Pierce comes back from the meeting，we________here for three hours.
#99405
A
will be waiting
B
is waiting
C
will wait
D
will have waited
(2013·高考湖南卷)—Have you heard about the recent election?—Sure，it________the only thing on the news for the last three days.
#99696
A
would be
B
is
C
has been
D
will be
(2014·东北三省三校一联)Traffic conditions in Beijing________for decades.At first people only complained about jams during rush hours，but today every hour is rush hour.
#99124
A
is worsening
B
have worsened
C
have been worsening
D
worsened