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  3. The theory was attacked ten years ago when it was first______, but gradually it was improved.

The theory was attacked ten years ago when it was first______, but gradually it was improved.

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问题 The theory was attacked ten years ago when it was first______, but gradually it was improved.
选项 A、promoted
B、enhanced
C、advanced
D、conceived
答案C
解析 动词辨析，C．advance推进，提出，如：advance a theory提出一种理论；A．promote提升，增进；B．enhance提高，增强，如：enhance one’s confidence增强信心：D．conceive构想，怀胎，如：conceive an idea想出一个主意。
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