— Has your sister finished her paper yet? — I don’t know. She ______ it this mor

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问题 — Has your sister finished her paper yet? — I don’t know. She ______ it this morning.

选项 A、writes
B、was writing
C、has written

答案 B

解析本题考查的是过去进行时的用法。句中this morning是过去的时间，今天早上“我”看见她正在写论文，表示过去某一时刻正在进行的动作，要用过去进行时。故B正确。

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