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    【题目】Researchers _______ to study mice from early ages but came across technical difficulties, so they weren’t sure they could expect clear results.

    A. intended B. were intended

    C. had intended D. had been intended

    【答案】C

    【解析】考查时态。句意：研究人员本打算从早期老鼠开始研究，但是遇到科技上的困难，所以他们不确定能否期待一个清晰的结果。had intended to意为“本来打算……却没有”，故选C。

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