单选题
The electricity went out ______we were making coffee.
A、
(A) so
B、
(B) because of
C、
(C) while
D、
(D) for
【正确答案】
C
【答案解析】
While is a subordinate conjunction that indicates simultaneous action. Choices (A) and (B) indicate cause and effect. Choice (D) indicates purpose.
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