17.Before patients＇ blood pressure is measured in a doctor＇s office,
    ___________ and at rest for at least 10 minute ..

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Before patients’ blood pressure is measured in a doctor’s office, have them seated and at rest 10 minutes appears to give more reliable results.
在病人到醫生那兒量血壓之前,為了要得到更可靠的結果,讓他們坐下至少十分鐘.
have them seated 是have+受詞+過去分詞, 具有命令的口氣,讓他們坐下=you must have them seat down.
如果是用having them seated是現在分詞的構句, 通常是形容詞子句時才用.
前面句子主詞是patients' blood pressure , 而後面句子的主詞不一樣,不能用分詞構句.

Ans:應該是(e)

您好

可是正式官方解答(d)having them seated
 

http://www.tncvs.tn.edu.tw/englishteachingweb/teac...attern/Participle1.htm

以上是分詞構句的網站,希望對這題目之解惑有幫助..