单项选择题
A.grave
B.serious
C.sad
D.burden
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单项选择题
A.ofB.inC.onD.with
A.of
B.in
C.on
D.with
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单项选择题
A.happyB.excitedC.relaxedD.bored
A.happy
B.excited
C.relaxed
D.bored
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