He studied hard and ____ pass the examination .
A．could able toB．couldC．was able toD．ought
C。
be able to 含有“經(jīng)過努力而完成某一動作”的意思，相當(dāng)于 manage to do 或 succeed in doing，而 can 只“單純地表示能力或可能”。
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