50. A doctor waswhen Mother fell ill.A. called inB. called upC. call uponD. called at

发布时间：2020-08-16 06:58:12


50. A doctor was    when Mother fell ill.
A. called in
B. called up
C. call upon
D. called at

网友回答

(答案→)A. called in
B. called up
C. call upon
D. called at
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