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By 'held back' (Line 1) the author means '______. '
A.made to remain in the same class
B.forced to study in the lower class
C.drawn to their studies
D.prevented from advancing

A.made
B.forced
C.drawn
D.prevented

【参考答案】

D
解析：此题也比较明显，原文中的“rarely”可资佐证，另外，“bock”也表示“停滞，退步”。
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