问题
选择题
.His conclusion, ______ on careful research, was acceptable.
A．to base
B．to be based
C．basing
D．based
答案
答案：D
考查非谓语动词。句中be based on以……为基础，在句中作定语，修饰His conclusion，相当于定语从句which is based on…，故选D。
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