问题
选择题
The guard____old man to pass after he showed him the pass.
A．promised
B．agreed
C．let
D．permitted
答案
答案：D
从句法上判断只有选项A和D形式上正确。promise意为”许诺，答应”，permit意为”允许，许可”。再从句意上判断，老人把通行证让卫兵看过后卫兵应允许他进去。故D为正确答案。
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