Susan decided not to write her resignation in the office because she didnt want her collea
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Susan decided not to write her resignation in the office because she didnt want her colleagues to know what she ______.
A．has done
B．had done
C．was doing
D．is doing
请帮忙给出正确答案和分析，谢谢！
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正确答案：C
根据句意，此处要用过去进行时表示过去正在进行的动作。由于decided和didn"twant都是过去式，故可排除选项A和D；再者，动作“做”发生在“决定”之后，而不是之前，故不能用过去完成时，答案为C。