单项选择题

Language learning is a slow process, which ______ a lot of effort, time and patience.

A．requires
B．leaves
C．pays
D．offers
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单项选择题
By the end of this year, they ______ a new program in Europe.
A．had started
B．start
C．are starting
D．will have started
单项选择题
______ traveling expenses rising a lot, Mrs. White had to change all her plans for the tour.
A．Since
B．As for
C．By
D．With
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