He met many problems           he was going over his lessons.
A．before B．a(chǎn)s soon as C．since D．while
D
本題的含義應(yīng)該是在復(fù)習(xí)功課的時候才遇到許多問題，是指一個時間概念，選項中
只有while表示在什么時候，故選D。
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