单项选择题

She ought to stop working; she has a headache because she ______ too long.

A．has been reading
B．had read
C．is reading
D．read
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单项选择题
Jack ______ yet, otherwise he would have telephoned me.
A．mustn't have arrived
B．shouldn't have arrived
C．can't have arrived
D．need not have arrived
单项选择题
______ might be expected, the response to the question was very mixed.
A．That
B．It
C．As
D．What
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