2. 专升本
  3. The reason why coal is still a very valuable source of power is ______atomic power is not available in sufficient quantity.

The reason why coal is still a very valuable source of power is ______atomic power is not available in sufficient quantity.

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问题 The reason why coal is still a very valuable source of power is ______atomic power is not available in sufficient quantity.
选项 A、because
B、that
C、as
D、for
答案B
解析
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