单项选择题

Shortage of capital is the main factor that ______economic development.

A．holds out
B．holds on to
C．holds back
D．holds on
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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
单项选择题
No one had told Smith about ______a lecture the following day.
A．there being
B．there be
C．there would be
D．there was
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