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【C20】A.beforeB.whenC.sinceD.until
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【C5】A.andB.howeverC.soD.therefore
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【C5】A.whichB.thatC.whatD.than
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【C5】A.beforeB.whileC.whenD.after
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【C19】A.beforeB.afterC.onD.until
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Its such a difficult problem______no one can work it out.A.asB.thatC.soD.this
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How is it ______ your roommates request and yours are identical?A.ifB.thatC.soD.what