The day will come _____ coal and oil will be used as raw material rather than fuels.
The day will come _____ coal and oil will be used as raw material rather than fuels.
A、as
B、while
C、when
D、whether
【正确答案】:C
【题目解析】:as意为”正如“;while意为”然而“;when意为”当...时“;whether意为”是否“。句意:总有一天煤和石油将被用作原料而不是燃料。
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