单项选择题

Only after I had reached the airport __________ that I had forgotten to take my ticket with me.

A．I realized
B．have I realized
C．did I realize
D．I had realized
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单项选择题
In order to search for the escaped prisoner, the policeman decided to question__________ comes along this road.
A．who
B．whom
C．whoever
D．whomever
单项选择题
Mr. Allen said that he did not want to __________ any further responsibilities.
A．take on
B．put on
C．get on
D．look up
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