12.So absorbedin her work that she didn't realize I was behind her.A. did sheB. was sheC.

问题补充：

12.So absorbedin her work that she didn realize I was behind her.

A. did she

B. was she

C. she did

D. she was

答案：

A. did she

(答案→)B. was she

C. she did

D. she was

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