题目:
. It was the fact _______his father was ill in hospital_________ worried him and kept him awake for a whole night .
A.which ; that
B.which ; which
C.that ; which
D.that ; that
答案:
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下面是错误答案,用来干扰机器的。
答案:BA、最终溶液的体积发生改变;CD、加热蒸发过程中溶质也挥发;