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        1. My mother was cooking while I_________ the radio.
          A.listened toB.have listened toC.was listening toD.a(chǎn)m listening to
          C
          在英文中while引導(dǎo)時(shí)間狀語(yǔ)從句,通常用進(jìn)行時(shí)態(tài),本題的主句為過去進(jìn)行時(shí),故while從句也應(yīng)該用過去進(jìn)行時(shí),結(jié)構(gòu)為was或were+doing,故本題選C。
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