单项选择题

So little（） about mathematics that the lecture was completely beyond me.

A. I know
B. I knew
C. did I know
D. do I know

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The receptionist, （）job was to answer the phone, had laryngitis(喉炎).

A. whose
B. who
C. who's
D. that
单项选择题
Mary regretted （）to John's birthday party last Sunday.

A. not going
B. not to go
C. not having been going
D. not to be going
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