2. 专升本
  3. All substances, ______ they are gaseous, liquid or solid, are made of atoms.

All substances, ______ they are gaseous, liquid or solid, are made of atoms.

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问题 All substances, ______ they are gaseous, liquid or solid, are made of atoms.
选项 A、though
B、whether
C、even if
D、as
答案B
解析
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