Usually ,( ) a waiter in a restaurant,raise one hand to head level or above .A,calling B,to call C,call D,having called.选哪一个,

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Usually ,( ) a waiter in a restaurant,raise one hand to head level or above .A,calling B,to call C,call D,having called.选哪一个,
Usually ,( ) a waiter in a restaurant,raise one hand to head level or above .
A,calling B,to call C,call D,having called.
选哪一个,

Usually ,( ) a waiter in a restaurant,raise one hand to head level or above .A,calling B,to call C,call D,having called.选哪一个,
B 不定式短语做目的性状语.这里表示为了做某事或去做某事.
其实正常语序时,它引导的句子在above的后面,这里它被提前作插入语了.

B
不定式表示目的:在酒店,为叫服务员,得把手抬至头顶处。

b

B