问题
选择题
His father is _____ engineer and he works _____ research.[ ]
A. an, on
B. an, with
C. the , on
D. a, with
答案
答案：A
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His father is _____ engineer and he works _____ research.[ ]
A. an, on
B. an, with
C. the , on
D. a, with
答案：A