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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