单项选择题

She ought to stop work; 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
Com originated in the New World and thus was not known in Europe until Colmnbus found it ______ in Cuba.
A．being cultivated
B．been cultivated
C．having cultivated
D．cultivating
单项选择题
President Wilson attempted to ______ between the powers to end the war, but neither side was prepared to give in.
A．segregate
B．whirl
C．compromise
D．mediate
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