单项选择题

Can you imagine the difficulty I had ______ language obstacles when I first studied abroad

A．to overcome
B．overcoming
C．overcome
D．overcame
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单项选择题
It was March 5, 2013 ______ Venezuelan President Hugo Chavez lost his last fight in life at the age of 58.
A．that
B．when
C．since
D．while
单项选择题
Only when the CIA Director David Petraeus was forced to resign ______ that it’s hard to keep our e-mails secret.
A．we realized
B．realized we
C．did we realize
D．we did realize
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