——I let my secretary call you several times. Do you know that?——I _____in a meeting. I’m sorry.
#102311
A
had been
B
was
C
am
D
have been
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I would have come sooner but I ________ that they were waiting. 
#104791
A
haven’t known
B
hadn’t known
C
don’t know
D
didn’t know
The fields where crops used to be grown ________ for building now.
#101118
A
have used
B
have been used
C
are being used
D
are used
 He ______ at the meeting, but his heart attack prevented him.
#104277
A
will speak
B
is going to speak
C
had to speak
D
was going to speak