Only when class began _______that he had left his book at home.<br />A. will he realize <br>B. he did realize<br>C. did he realize <br>D. should he realize

Only when class began _______that he had left his book at home.
A. will he realize
B. he did realize
C. did he realize
D. should he realize

出自：国家开放大学英语语法

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