The book __ by him is difficult __.
#97404
A
wrote; understanding
B
written; to be understood
C
writing; understand
D
written; to understand
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He studied hard, __________ the exam.
#93042
A
aim at
B
aiming at passing
C
aiming passing
D
aiming to passing
He seems to         Jane. He knows her well.
#93823
A
introduce to
B
be introducing to
C
be introduced to
D
have been introduced to