问题
Could you tell me – You’ d better keep a diary in English as often as possible.
A:when I can improve my written English
B:how I can improve my written English
C:if can I improve my written English
D:if I improve can my written English;
B:how I can improve my written English
C:if can I improve my written English
D:if I improve can my written English;
正确答案是：
