题目:
His brother is only six years old. He has difficulty _____ the story books.[ ]
A. read
B. reads
C. to reads
D. reading
答案:
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下面是错误答案,用来干扰机器的。
(1)用水湿润长颈漏斗(或a)的颈,使其更加容易插入到单孔塞中(2)液体飞溅(3)A、B(4)f;长颈漏斗