David wants to be _______ engineer while...

David wants to be _______ engineer while Cathy wants to be _______ doctor.

A．an; the

B．the ; the

C．an; a

D．the;

C 【解析】试题分析：考查冠词。本题使用不定冠词a/an+单数名词泛指一类职业.句意：David想做工程师，而Cathy想做医生。故C正确。考点：考查冠词

考点分析：

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