问题
选择题
He studied hard and ____ pass the examination .
A．could able to
B．could
C．was able to
D．ought
答案
C。
be able to 含有“经过努力而完成某一动作”的意思，相当于 manage to do 或 succeed in doing，而 can 只“单纯地表示能力或可能”。
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