.His conclusion, ______ on careful research, was acceptable.
A．to baseB．to be basedC．basingD．based
D
考查非謂語(yǔ)動(dòng)詞。句中be based on以……為基礎(chǔ)，在句中作定語(yǔ)，修飾His conclusion，相當(dāng)于定語(yǔ)從句which is based on…，故選D。
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