Do you have any idea ______ on earth has happened to our friend?
A．thatB．whatC．a(chǎn)sD．which
B
考查同位語從句。what on earth has happened to our friend是一個(gè)同位語從句解釋前面的idea, what在句中做主語。句意：你知道我們的朋友究竟發(fā)生了什么事情了嗎？
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