单项选择题


A．elementary
B．crucial
C．rudimentary
D．fundamental
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单项选择题
A．on thatB．on whichC．at thatD．at which
A．on that
B．on which
C．at that
D．at which
单项选择题
A．whichB．whatC．thatD．
A．which
B．what
C．that
D．/
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