Select the grammatically correct sentence:
1. My sister had left for America last week.
2. My sister has been left for America last week.
3. My sister has left for America last week.
4. My sister left for America last week
Answer: D
It is sentence 4.
Last week is a finished period, so it takes the simple past. Neither the past perfect nor the present perfect can be used with an explicit past time expression.
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