单项选择题

E-mail is much ______ than long-distance calling.

A. cheap
B. cheaper
C. cheapest
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单项选择题
—Did Nancy come for the meeting last night —No. She was so tired that she soon ______ in her room.
A. fell behind
B. fell asleep
C. fell off
单项选择题
______ it was getting so late, we turned back.
A. As
B. Lest
C. So
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