Listen to the two girls by the window. What language ________? 
#100338
A
did they speak
B
were they speaking
C
have they been speaking
D
are they speaking
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Computers ____ in offices and homes since 1970s. 
#100256
A
have been used
B
had been used
C
was used
D
has been used
Unfortunately, when I dropped in, Professor Smith ________, so we only had time for a few words. 
#104738
A
has just left
B
had just left
C
just left
D
was just leaving
The man insisted that he ___ innocent.
#103524
A
was
B
should be
C
be
D
were