问题
选择题
—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
答案
答案：D
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。