I have been abroad for more than once., I have never copied homework from my classmate., Sally has never swum in the sea., Cody's sister has tried going to the gym to stay in shape., Mr. Wang has taught math for ten years., They have known each other since they were in junior high school., Has Amy woken up yet?, How long has Ela been on a diet?, Vivian has taken out the trash already., Have you ever been to the USA?,

翰林B5 U1：Grammar Focus – 現在完成式

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