It is said in the book that Thomas Edison (1847—1931) ________ the world-leading inventor for sixty years.
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A
would be
B
has been
C
had been
D
was
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Listen to the two girls by the window. What language ________?
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A
did they speak
B
were they speaking
C
have they been speaking
D
are they speaking
—Could I use your car tomorrow morning?—Sure.I________a report at home. (2013·江苏，25)
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A
will be writing
B
will have written
C
have written
D
have been writing
Taiyuan, a city in North China, was struck by a heavy snowfall last week, ______ serious traffic problems.
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A
to face
B
faced
C
having faced
D
facing
With the development of modern society, E-mail as well as telephones an important part in daily communication.
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A
have played
B
is playing
C
are playing
D
played
—How did she get infected? —She ____ the viruses without any protection.
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A
exposed to
B
had exposed to
C
was exposed to
D
has exposed to