There was a lot of fun at yesterday’s party. You _______, but why didn’t you? 
#101093
A
should come
B
may come
C
ought to have come
D
may have come
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--- Hi, Tracy, you look tired.  --- I’m very tired. I ____ the living room all day.
#102531
A
painted
B
had painted
C
am painting
D
have been painting
 —What do you think of his speech at the court?—Er..., sorry, I ________ about something else.
#100343
A
had thought
B
thought
C
was thinking
D
have been thinking
E-mail , as well as cellphones, _____an important part in daily communication.
#102596
A
have played
B
play
C
are playing
D
is playing
Computers          in offices and homes since 1970s.
#99298
A
was
B
had been used
C
have been used
D
has been used