问题
I know one of the things I was unsure about was _____hard it would be to climb this mountain
A:an；the
B:/；the
C:an；/
D:the；a
B:/；the
C:an；/
D:the；a
正确答案是：
同类题型
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How was your day off during the Qingming Festival— Pretty good! We XuXiaoxuan’s former home.
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