问题
单项选择题
At（）an occasional survey has been carried out.
A.the remind of the master
B.the refer of the master
C.the render of the master
D.the request of the master
答案
参考答案：D
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At（）an occasional survey has been carried out.
A.the remind of the master
B.the refer of the master
C.the render of the master
D.the request of the master
参考答案：D