The girl is very shy, and never speaks until ___ to.

The girl is very shy, and never speaks until ___ to.

A.spoken

B.speaking

C.speak

D.be spoken

答案及解析： A

解析：

这个句子中的从句省去了相同的主语she和be动词，完整的句子为：The girl is very shy, and never speaks until she is spoken to.