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单选题
21.They are going to have the engineeran instrument in the office next week.
A
A.install
B
B.to install
C
C.to be installed
D
D.installed
答案解析
正确答案：A
解析：
21. 【翻译】他们准备让那个工程师下周在办公室里安装一台仪器【精析】A have sb. do sth.为固定用法，意为“让某人做某事"，其中省略了 to的不定式作宾语补足语＜,engineer和 instalK安装）之间是逻辑上的主谓关系，所以应用省略to的不定式。have sth. done意为“使某事/某物被（别人） 做”，不符合题意:故选A
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