One learns a knowledge by making mistakes and ______ them.
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A
corrects
B
correct
C
to correct
D
correcting
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Come and visit me whenever _______.
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A
you are convenient
B
you will be convenient
C
it is convenient for you
D
it will be convenient for you
Not until I had arrived home______ my appointment with Michael Smith.
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A
did I remember
B
that I remember
C
when I remember
D
had I remember