-Do you often go fishing at weekends?-Not often.I only go fishing .A．at one time

—Do you often go fishing at weekends?

—Not often，I only go fishing________.

试题答案

D

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。