scientists have done a lot of research on A flu,there are still some cases for further study. A. As B. Once C. If D. Although 题目和参考答案——青夏教育精英家教网—

题目内容

9.(2013 广东) scientists have done a lot of research on A (H7N9)flu,there are still some cases for further study.

A. As B. Once C. If D. Although

9. D

句意:虽然科学家们对甲型(H7N9) 流感做了很多研究，但仍需对一些病例做进一步研究。

as当时，因为；once—旦;if如果;although虽然。由题意可知设空处引导让步状语从句。故选D.

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