He _____ run and walk since he left hospital last month.
A. will be able to
B. is able to
C. has been able to
D. was able to
【答案】C
【解析】句意：自从上个月出院以来，他一直就能跑步和走路。由句子since he left hospital last month. 可知，主句的时态用现在完成时，A. will be able to 一般将来时；B. is able to一般现在时；C. has been able to现在完成时；D. was able to一般过去时。故选C。
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