单项选择题

A．did not see
B．have not seen
C．had not seen
D．had not been seeing
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单项选择题
A．LookedB．LookingC．SeeingD．Saw
A．Looked
B．Looking
C．Seeing
D．Saw
单项选择题
A．askedB．to have askedC．askingD．being asked
A．asked
B．to have asked
C．asking
D．being asked
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