问题
选择题
In recent years the environmental pollution has been _________ than before.
A．so serious
B．serious
C．more serious
D．too serious
答案
答案：C
题目分析：句意：最近环境污染已经比以前更严重了，根据题意可知用形容词的比较级more serious更污染。结合语境故选C
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