In this country, coal electricity.
A. is used to produce
B. is used to produced
C. is used to producing
D. used to produce
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(答案→)A. is used to produce
B. is used to produced
C. is used to producing
D. used to produce
解析：本题考查短语搭配。be used to do被用来做，根据句意：在这个国家，煤被用来发电。选A。