A. synonymous with B. compatible with C. subordinate to D. autonomous of
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
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
