单项选择题

Do not read ______ you are in bed.

A．since
B．for
C．because
D．when
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单项选择题
Not until quite recently ______ known what a spaceship was like.
A．had I
B．I had
C．I didn"t have
D．will I have
单项选择题
She can hardly understand what the teacher has said, ______.
A．nor shall I
B．so do I
C．neither can I
D．can I
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