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-- 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
C
前空表示還沒有決定，用現(xiàn)在完成時；后空表示現(xiàn)在正在做的事，用進行時。
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