单项选择题

-I must apologize for______ahead of time. -That’s all right.

A．letting you not know
B．not letting you know
C．letting you know not
D．letting not you know
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单项选择题
Rather than______on a crowded bus, he always prefers______ a bicycle.
A．ride; ride
B．riding; ride
C．ride; to ride
D．to ride; riding
单项选择题
We all write______, even when there’s not much to say.
A．now and then
B．by and by
C．step by step
D．more or less
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