Small as it is，the ant is as much a creature as all other animals on the earth.
A. are
B. is
C. have
D. do
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(答案→)A. are
B. is
C. have
D. do
解析：本题主要考查对句子结构的辨析。根据句子的意义可知，第二个as引导一个定语从句修饰先词a creature；根据句子结构，先行词在从句中作表语，从句的谓语动词的形由后面的主语all other animals决定。