Two weeks ago, I bought a bicycle. If you live in town, it is often faster than a car and you           worry about parking. 
#63007
A
must not
B
should not
C
don't have to
D
may not
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My sister met him at the street yesterday afternoon, so he __________ your lecture.
#63077
A
shouldn’t have attended
B
couldn’t have attended
C
mustn’t have attended
D
needn’t have attended