It is rather _____ that the research team as a whole still has little idea about the cause of that fatal disease. A.rewarding B.demanding C.embarrassing D.requiring

It is rather _____ that the research team as a whole still has little idea about the cause of that fatal disease.

A.rewarding
B.demanding
C.embarrassing
D.requiring

出自：信阳师范学院-英语语音

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