The house could fall down soon if no one       some quick repair work.
A．has doneB．is doingC．doesD．had done
C
考查時(shí)態(tài)。在if引導(dǎo)的條件狀語(yǔ)從句中，當(dāng)主句中含有情態(tài)動(dòng)詞時(shí)，從句用一般現(xiàn)在時(shí)。注意此處主句中的could表示不太肯定的語(yǔ)氣，不是一般過(guò)去時(shí)的標(biāo)志。
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