问题补充：
-- You can use MSN to talk with Vivien on the Internet.
--- I know. But can you tell me ?
A. when I can use it
B. what I can use it
C. why can I use it
D. how can I use it
答案：
(答案→)A. when I can use it
B. what I can use it
C. why can I use it
D. how can I use it
解析：本题考查宾语从句的用法，宾语从句要用陈述句语序，故排除C、D；因为use前有主语I，其后有宾语it，故不可用what引导，故选A。
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