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  3. Perhaps the days may not be long in coming ______ all the valuable substances in coal and oil will be fully utilized.

Perhaps the days may not be long in coming ______ all the valuable substances in coal and oil will be fully utilized.

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问题 Perhaps the days may not be long in coming ______ all the valuable substances in coal and oil will be fully utilized.
选项 A、where
B、when
C、as
D、so
答案B
解析 when表时间。
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