问题描述：
Although ___ very hard,he failed to start his car. A.worked. B.work C.working. D.being worked ...
Although ___ very hard,he failed to start his car.
A.worked. B.work C.working. D.being worked
为什么选C不选别的
Although ___ very hard,he failed to start his car.
A.worked. B.work C.working. D.being worked
为什么选C不选别的
问题解答：
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