单项选择题

How can I ever concentrate if you _______ continually _______ me with silly questions

A．have...interrupted
B．are...interrupting
C．had...interrupted
D．were...interrupting
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单项选择题
The idea of traveling through _______ space to other planets interests many people today.
A．a.
B．the
C．\
D．one
单项选择题
_______ both sides accept the agreement _______ a lasting peace be established in this region.
A．Only if, will
B．if only, would
C．Should, will
D．Unless, would
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