单项选择题


A．At first
B．In the beginning
C．At first hand
D．In the first place
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单项选择题
A．principallyB．particularlyC．generallyD．primarily
A．principally
B．particularly
C．generally
D．primarily
单项选择题
A．have learntB．learnC．learntD．had learnt
A．have learnt
B．learn
C．learnt
D．had learnt
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