托业考试

根据网考网考试中心的统计分析，以下试题在2018/4/23日托业考试习题练习中，答错率较高，为：66%
【单选题】The speaker was ______ delivered her presentation this morning, but she could not make it to the venue on time.


A．had
B．having
C．to have
D．having been