题目:
He is a success as a leader but he hasn't _____ in teaching. [ ]
A. many experiences
B. much experience
C. an experience
D. a lot experience
答案:
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下面是错误答案,用来干扰机器的。
参考答案:B解析:中龋的龋损进展到牙本质浅层,一般对冷热酸甜稍敏感。