单项选择题

When I was sent to prison, I really felt I had （） my parents （）.

A. let... off
B. let... down
C. let... out
D. let... alone

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单项选择题

I missed the last flight, and decided （） to stay the night at the airport.

A. however
B. therefore
C. moreover
D. meanwhile

单项选择题

She chewed each delicious mouthful as slowly as she could, ______ the pleasure.

A. delaying
B. prolonging
C. insisting
D. indulging

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