________ both sides accept the agreement will a lasting peace be established in

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________ both sides accept the agreement will a lasting peace be established in this region.[ ]
A. If only
B. Only if
C. Unless
D. As long as

答案

举一反三

In time of serious accidents, we know some basic things about first aid,        we can save lives.   [     ]
A．whether
B．until
C．if
D．unless

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There are many things to consider when you are looking for a house, ____ to buy or just intend to rent.   [     ]
A．though
B．although
C.   if
D．whether

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It was some time        we realized the truth.    [     ]
A．when
B．until
C．since
D．before

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Scientists say it may be five or six years         it is possible to test this medicine on human patients.
[     ]
A. since
B. after
C. before
D. when

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Please remind me            he said he was going. I may be in time to see him off.    [     ]
A. where
B. when
C. how
D. what

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