問題補充：
單選題
In the final exam of last term, our maths teacher Mr.Wu gave us ________we all couldn’t work outA.such a difficult problem thatB.so a difficult problem asC.so difficult a problem thatD.as difficult a problem as
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D解析本題考查狀語從句。本題考查so/as + adj. + a/an + n. + as或such + a/an + adj + n. + as結構，根據(jù)其結構，故選D。
