My mother was looking while I         the radio.
A．listened toB．have listened
C．was listening toD．is listening to
C
while連詞，表示對(duì)比譯為“然而”，其前后時(shí)態(tài)保持一致。 句意：媽媽看東西然而我在聽收音機(jī)。While前用的是過去進(jìn)行時(shí)態(tài)故后面也要一致故選C
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