43． _________ scientists have done a lot of research on A (HINl) flu，there are still some cases for further study． -题库考试答案搜索网

43． _________ scientists have done a lot of research on A (HINl) flu，there are still some cases for further study．

单选题

2022-01-01 08:00

A、As
B、Once
C、If
D、Although

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试题解析

43.D【解析】句意：虽然科学家对甲型HIN1流感做了很多研究，但很多病例仍然有待进一步研究。as 当……时}因为；once一旦I if如果* although尽管。从题意可知此题是一个让步状语从句。故选D。

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