单选题
My sister's professor had her ______ paper many times before allowing her to present it to the committee.
【正确答案】
B
【答案解析】[分析] 本题考点为非谓语动词的用法之一。当不定式作宾补，渭语是感觉动词hear，feel，see，watch， observe等，或使役动词let，have，make，keep等时，不定式不带to；如果不定式由主动变被动，不定式由宾补变主补时，不定式则保留to。例如：He was made to leave the work undone．I had her retype the letter although it was late．