________ in health，he persisted in doing the experiment. [ ]A．As he was poo

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________ in health，he persisted in doing the experiment. [ ]

A．As he was poor
B．Poor as he was
C．Poor was he
D．Poor he was though

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举一反三

I didn"t manage to do it ________ you had explained how.[      ]
A. until
B. unless
C. when
D. before

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The film is really wonderful.It"s such a long time ________ I enjoyed myself so much.[     ]
A. when
B. before
C. as
D. since

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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

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________ 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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