谁能解析一下这题的答案呀？
17.Iadvisedherthatinthepresenceoftheprincesssheshouldnotsayanythinguntil_B______.a.be...
17. I advised her that in the presence of the princess she should not say anything until _B______.
a. being asked b. asked c. to be asked d. having been asked 展开
a. being asked b. asked c. to be asked d. having been asked 展开
2个回答
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应该是until she was asked。只不过这里省略了而已
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A 直到被询问
until后加ING，又是被动式，所以就选了A
until后加ING，又是被动式，所以就选了A
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