问题补充:
He be sitting at the gate, waiting for his lost son.
A. used to
B. was used to
C. could
D. was accustomed
答案:
(答案→)A. used to
B. was used to
C. could
D. was accustomed
解析:句意:他过去常常坐在门口,等候他的失踪的儿子。used to do过去常常;was used to doing习惯于;was used to do被用来;could能够;be accustomed to doing 习惯于。根据句意故选A。