单项选择题

I'm afraid I've taken ______ too much of your time.

A．up
B．after
C．in
D．back
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单项选择题
She looked everywhere for her book but ______ had to return home without it.
A．lastly
B．at the end
C．in the end
D．at the last
单项选择题
It's true that the old road is less direct and a bit longer. We won't take the new one. ______, because we don't feel as safe on it.
A．Somehow
B．Though
C．Therefore
D．Otherwise
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