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：郑州师范学院大学英语

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