The rate of racial progress varies in different areas of the country, but in the past ten years _________ more improvement.
#101835
A
there is
B
it is
C
there have been
D
there has been
推荐题目
I won’t tell the student the answer to the math problem until he ______ on it for more than an hour.
#104700
A
has been working
B
will have worked
C
will have been working
D
had worked
Without this year’s Nobel Prize in physics winner Charles Kao’s idea of fibrotic（光纤的）communications, the “modern” telephone and Internet _________impossible．
#103582
A
will be
B
were to be
C
should be
D
would be
In the past decades, sea ice _____in the Arctic as a result of global warming.
#102142
A
had melted
B
has been melting
C
melted
D
is melting
The government has taken some measures to prevent more trees from _____.
#100712
A
cutting down
B
cut down.
C
being cut down
D
been cut down
—Hello, can I speak to Robert, please?—Hold on, please. He ________ in the garage.
#103901
A
has worked
B
is working
C
worked
D
will work