单项选择题

It worried her a bit ______ her hair was turning grey.

A．while
B．that
C．if
D．though
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单项选择题
-- Jane, what do you think of Mr Green -- As ______ teacher, he ought to set ______ good example to the pupils.
A．the; a
B．a; a
C．a; the
D．/; the
单项选择题
Please give me ______. I'm not tall enough to reach the book on the top of the bookshelf.
A．a hand
B．help
C．hands
D．helps
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