题目内容
（请给出正确答案）
Only after they had performed hundreds of experiments did they succeed in (solve) ______the problem.
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Only after he had finished watching the football game ____________ (他才开始写报告).
Only after a year______ to see the results of my experiment.
A．I began
B．I had begun
C．have I begun
D．did I begin
The nearest hospital Dr. Drew had been taken to after the accident was for ______ .
A．blacks only
B．whites only
C．both whites and blacks
D．the colored
Only after he read the article again __________ that he had made a big mistake.
[A] Jack has realized
[B] did Jack realize
[C] has Jack realized
[D] Jack realized
A．freemen had incentives to produce more.
B．masters had greater incentive to make their workers harder.
C．slaves never starved, no matter what they produced.
D．productivity could go in only one direction.
A.be broken into
B.had broken into
C.was broken into
D.had been broken into
A．It had a definite, known accuser.
B．It was only used after the Norman Conquest.
C．It had no secrecy in the proceedings.
D．It required judges to question witnesses.
A．Because she hadn't heard of the writer at the time.
B．Because it wasn't on any of the professors' reading lists.
C．Because it was published after she had finished her research.
D．Because it was only available in French.
For seven days after the mud-slide, they had only grass and tree leaves to subsist upon.
A．made food out of
B．substitute for beds
C．live upon by eating
D．insist on keeping to themselves
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