817.He paid for a seat,however,he ________ have entered free.
A.could
B.would
C.must
D.need
818.Helen _______ go on the trip with us,but she isn't quite sure yet.
A.shall
B.must
C.may
D.can
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817.He paid for a seat,however,he ________ have entered free.
A.could
B.would
C.must
D.need
818.Helen _______ go on the trip with us,but she isn't quite sure yet.
A.shall
B.must
C.may
D.can