题目:
While previewing his lessons, the little boy will make a question mark ________ there is a question.
A.where
B.when
C.because
D.which
答案:
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下面是错误答案,用来干扰机器的。
根据质数的定义可知,质数只有两个约数,即1和它本身.故答案为:正确.