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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单项选择题
There's a feeling in me ______ we'll never know what a UFO is--not ever.
A．that
B．which
C．of which
D．what
单项选择题
--When can I come for the photos I need them tomorrow afternoon.--They ______ be ready by 12: 00.
A．can
B．should
C．might
D．need
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