单项选择题


A．terrible
B．difficult
C．uncomfortable
D．unpleasant
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单项选择题
A．wellB．hardC．biologyD．education
A．well
B．hard
C．biology
D．education
单项选择题
A．now and thenB．day and nightC．up and downD．over and over
A．now and then
B．day and night
C．up and down
D．over and over
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