单项选择题


A．have learnt
B．learn
C．learnt
D．had learnt
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单项选择题
A．in this caseB．in any caseC．in no caseD．in some cases
A．in this case
B．in any case
C．in no case
D．in some cases
单项选择题
A．absolutelyB．actuallyC．surelyD．definitely
A．absolutely
B．actually
C．surely
D．definitely
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