问题
选择题
His mother ＿＿＿＿＿ teacher.
A．became
B．has turned
C．came
D．proved
答案
答案：B
turn作为系动词时，其后接名词，前不加不定冠词。
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His mother ＿＿＿＿＿ teacher.
A．became
B．has turned
C．came
D．proved
答案：B
turn作为系动词时，其后接名词，前不加不定冠词。