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SAT语法提问In 1882,there only seven female doctors practicing in

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SAT语法提问
In 1882,there only seven female doctors practicing in France,when in 1903 the number rising to 95.
A.when in 1903 the number rising to 95
B.but by 1903 the number had risen
C.its number rising in 1903
E.However,in 1903when the number had risen
为什么是选B,A错在哪了?
SAT语法提问In 1882,there only seven female doctors practicing in
when这里又引导了一个句子了,而A中有谓语动词吗?但是B中却有,这就是原因!