he lost his sight because of an accident is unknown. [ ] A.Whether B.If C.Why D.
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![he lost his sight because of an accident is unknown. [ ] A.Whether B.If C.Why D.](/pic/43_783610.jpg)
________ he lost his sight because of an accident is unknown.
[]A.Whether
B.If
C.Why
D.What
试题答案
答案:A
![he lost his sight because of an accident is unknown. [ ] A.Whether B.If C.Why D.](/pic/43_783610.jpg)
________ he lost his sight because of an accident is unknown.
[]A.Whether
B.If
C.Why
D.What
答案:A