单项选择题


A．physics
B．physicist
C．physical
D．difficult
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单项选择题
A．has hadB．wasC．has beenD．were
A．has had
B．was
C．has been
D．were
单项选择题
A．quickerB．biggerC．slowerD．smaller
A．quicker
B．bigger
C．slower
D．smaller
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