—Do you often go fishing at weekends?
—Not often，I only go fishing .
A. at one time
B. all the time
C. at a time
D. from time to time
网友回答
A. at one time
B. all the time
C. at a time
(答案→)D. from time to time
解析：
考查介词短语。at one time曾经；all the time始终；at a time每次；from time to time有时。由句意可知D项正确。