There were so many cars held up by the heavy rain on the road that we had no but to wait.
A. alternative
B. difference
C. relation
D. opposition
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(答案→)A. alternative
B. difference
C. relation
D. opposition
解析：考察名词.alternative 可供选择的办法或事物 have no alternative but to do sth 意为，别无选择，只能干某事 ，相当于have no choice but to do sth ，为固定句型 difference区别 relation 关系 opposition 反对
句意为，有很多的汽车因为大雨被拦在了路上，以致于我们别无选择，只能等待