题目内容

Do you have any idea ______ on earth has happened to our friend?
A．thatB．whatC．asD．which
B
考查同位语从句。what on earth has happened to our friend是一个同位语从句解释前面的idea, what在句中做主语。句意：你知道我们的朋友究竟发生了什么事情了吗？
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