单项选择题
Even if he （）here, he would not be able to help us.
A.is B.were C.has been D.will be
单项选择题 Notonly（）apromise，buthekeptit.
单项选择题 Itis（）onethousandstudentscanliveinit.
单项选择题 Thesurgeon’sadvicewasthatthepatient（）atonce.
