单项选择题


A．As early as
B．Early
C．Early as
D．Earlier
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单项选择题
A．be taking placeB．take placeC．be taken placeD．have taken place
A．be taking place
B．take place
C．be taken place
D．have taken place
单项选择题
A．whenB．whileC．sinceD．then
A．when
B．while
C．since
D．then
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