They are going to have the serviceman______ an electric fan in the office tomorrow.

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问题 They are going to have the serviceman______ an electric fan in the office tomorrow.

选项 A、install
B、to install
C、to be installed
D、installed

答案A

解析 在作feel,listen,hear,have,make,let,watch,see,notice,observe,look等感官动词以及使役动词的宾语补足语时,不定式的符号to必须省略;在作help的宾语补足语时,不定式的符号to可以省略,也可不省略,例如:The children were surprised when theteacher had them close their books unexpectedly.老师突然让他们把书都合上,孩子们感到很惊讶。We can make the liquid nitrogen turn back into gas.我们能使液体氮重新变成气体。
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