【題目】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】考查時態(tài)。句意：研究人員本打算從早期老鼠開始研究，但是遇到科技上的困難，所以他們不確定能否期待一個清晰的結果。had intended to意為“本來打算……卻沒有”，故選C。

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