问题补充：
A:Do you know for advice when we have problems.
B:You can talk to your parents or teachers.
A. who to talk
B. when to talk to
C. who to talk to
D. who can we talk to
答案：
A. who to talk
B. when to talk to
C. who to talk to
D. who can we talk to
解析：考查特殊句式。句意：你知道当我们有困难跟谁寻求帮助吗？你可以跟父母或者老师。考查特殊疑问词+不定式做know的宾语，talk to sb 与某人交谈，所以选C项。
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