-- How are you planning to travel to Shanghai?
--- I yet, but I taking a train.
A. didn’t decide; am considering
B. haven’t decided; consider
C. haven’t decided; am considering
D. hadn’t decided; have considered
网友回答
A. didn’t decide; am considering
B. haven’t decided; consider
(答案→)C. haven’t decided; am considering
D. hadn’t decided; have considered
解析：前空表示还没有决定，用现在完成时；后空表示现在正在做的事，用进行时。