As an atom absorbs energy,_______ increases, and the atom is said to be
excited.
(A) its energy level
(B) as its energy level
(C) it is energy level
(D) the energy level of its
As 為時間副詞 As an atom absorbs energy 為時間副詞子句 And the atom...為對等子句故 and前面 ---- increases 勢必為完整的句子 故B為錯誤選項,B選項中的as連接詞為多餘的,形成錯誤的語法 而 increases 為此句子的動詞,故 C 為錯誤選項,一個句子只能一個動詞