Only when class began _______that he had left his book at home.
A．will he realizeB．he did realize
C．did he realizeD．should he realize
C
 "only+狀語"放于句首，應(yīng)構(gòu)成倒裝句，主語前要加助動詞，由時態(tài)看為一般過去時。
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