问题
单项选择题
You didn't have to write the essay if you didn't want to. It was（）
A.compulsory
B.suitable
C.alternative
D.optional
答案
参考答案：D
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You didn't have to write the essay if you didn't want to. It was（）
A.compulsory
B.suitable
C.alternative
D.optional
参考答案：D