All substances, ＿＿＿＿＿ solids, liquids, or gases, are made up of entirely atoms.
A．whether theyB．whether C．whether are theyD．whether are
B
在帶有狀語從句的復(fù)合句中，如果從句與主句的主語一致，且從句中含有be動(dòng)詞，則可以省略從句的主語及be動(dòng)詞。此處從句中省略了they are。
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