As is known, ________we know some basic knowledge concerning AIDS, we can protec

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As is known, ________we know some basic knowledge concerning AIDS, we can protect
ourselves from being infected.[      ]
A. as far as
B. if only
C. so long as
D. unless

答案

举一反三

________ everyone else wouldn"t go to the mountain area, he went without a second thought. [     ]
A. As long as
B. While
C. Where
D. In spite of

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—The plane is due to take off at 7:50 from the airport.
—________ we fail to arrive there in time?
—Try to take another flight then. [     ]
A. What if
B. As if
C. Even if
D. Only if

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He is only too ready to help others, seldom, ________ refusing them when they turn to him. [     ]
A. if never
B. if ever
C. if not
D. if no

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John seems an honest person; ________, I don"t trust him. [     ]
A. even though
B. even so
C. therefore
D. though

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Everything has gone well as expected so far.________, we have no doubt that we"ll finish the task on
time. [     ]
A. Otherwise
B. Besides
C. Therefore
D. However

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