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

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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