It was required by the headmaster that all the students        at the meeting.
#87897
A
should present
B
present
C
attended
D
be present
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I know it’s normal for such a thing to happen, but we _____ it if we’d been more careful.
#86837
A
need have avoided
B
could have avoided
C
will have avoided
D
had avoided
_____ your advice, I would have had no trouble with my papers.
#90229
A
Had I followed
B
If I followed
C
If I have followed
D
Once I followed