单项选择题

If he had left in time for the last bus, he ______ it.

A．shouldn't have missed
B．ought not have missed
C．mustn't have missed
D．couldn't have missed
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单项选择题
The planned development of the deserted island filled the islanders with ______ hope.
A．eternal
B．ceaseless
C．infinite
D．incessant
单项选择题
Human beings have used tools for a long time, ______ they would not have been able to develop their intelligent so fast.
A．doubtlessly
B．therefore
C．otherwise
D．consequently
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