【C12】A．whenB．thoughC．untilD．for

【C12】A．whenB．whateverC．whereD．how

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【C10】A．whenB．thoughC．whileD．however

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【C10】A．whenB．afterC．untilD．while

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【C9】A．whenB．ifC．untilD．after

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【C12】A．beforeB．unlessC．untilD．once

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The couple had no sooner got to the station_____the coach left.（2009)A．whenB．asC．untilD．th

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They did the experiment______ their chemistry teacher had instructed.A．asB．thoughC．untilD．

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