--Who are you ?-- My mother.A. waitB. waitingC. waiting forD. wait for

问题补充：

--Who are you ?

-- My mother.

A. wait

B. waiting

C. waiting for

D. wait for

答案：

A. wait

B. waiting

(答案→)C. waiting for

D. wait for

解析：本句子有，are 所以后接动词现在分词，同时wait 为不及物动词，后接宾语时，加介词for ，故选C

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