问题补充：
The writer is not satisfied with buses are too crowded.
A. that
B. which
C. what
D. the fact that
答案：
A. that
B. which
C. what
(答案→)D. the fact that
解析：考查同位语从句。句意：这位作家不满意这个事实，就是公交车太拥挤。that buses are too crowded是同位语从句，解释前面的名词the fact，所以选D。
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