问题
选择题
It was not until Susan came back ______her close friends were waiting for him.
A．which she knew
B．which did she know
C．that she knew
D．that did she know
答案
答案：C
题目分析： 考查强调句：It was not until…that….，句意：直到苏珊回来她才知道她的亲密的朋友在等着她。注意that后面的句子不用倒装，因为这里not until不是放在句首的，选C。