问题
选择题
---Can you tell me how often he practices his English?
---__________.
A．At times
B．At one time
C．At all times
D．At a time
答案
答案：A
题目分析：考查介词短语：A. At times有时，B. At one time曾经，一度，C. At all times一直，D. At a time一次，句意：--你能告诉我他多长时间练一次英语吗？--有时。选A。