Question

【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

Answer 1

【答案】C

【解析】考查時(shí)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(gè)清晰的結(jié)果。had intended to意為“本來打算……卻沒有”，故選C。