( ) 13.While a little baby,Tom could ________ songs.A.sing B.sings C.hum D.hums为什么不能用hum?

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( ) 13.While a little baby,Tom could ________ songs.A.sing B.sings C.hum D.hums为什么不能用hum?

( ) 13.While a little baby,Tom could ________ songs.A.sing B.sings C.hum D.hums为什么不能用hum?
( ) 13.While a little baby,Tom could ________ songs.
A.sing B.sings C.hum D.hums
为什么不能用hum?

( ) 13.While a little baby,Tom could ________ songs.A.sing B.sings C.hum D.hums为什么不能用hum?
hum是不及物动词,后面不能加songs