有關英文文法的問題 (慣用語 時態)

If you have____ , you should see a doctor. 答案是the flu, 為什麼an influenza不可呢 The children have been enjoying themselves today. 味什麼要用完成式 而不是enjoyed As for Friday, he hadn’t completed the report. as for Friday是否可用until Friday
更新: I can’t understand you when you speak ___ chewing your food.
答案是while 可是這樣不就雙重連接詞嗎?
更新 2: 是的, 我所發問的是來字書本的題目,書本並未說明未什麼an influenza不可

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