问题
选择题
— Do you often visit your grandparents?
— Mmm… ________ , I’m afraid. I usually phone them.
A．over again
B．time and again
C．once again
D．now and again
答案
答案：D
over again反复，time and again和over again 均为又一次之意。now and again时而，只有D与题意相符。