He got well­prepared for the job interview,for he couldn't risk________the opportunity. 
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A
to lose
B
losing
C
to be lost
D
being lost
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He studied hard, __________ the exam.
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A
aim at
B
aiming at passing
C
aiming passing
D
aiming to passing
He seems to         Jane. He knows her well.
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A
introduce to
B
be introducing to
C
be introduced to
D
have been introduced to