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.
在病人到医生那儿量血压之前,为了要得到更可靠的结果,让他们坐下至少十分钟.
have them seated 是have+受词+过去分词, 具有命令的口气,让他们坐下=you must have them seat down.
如果是用having them seated是现在分词的构句, 通常是形容词子句时才用.
前面句子主词是patients' blood pressure , 而后面句子的主词不一样,不能用分词构句.

Ans:应该是(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

以上是分词构句的网站,希望对这题目之解惑有帮助..