题目:
Thanks for ________ a birthday party for me, Mum and Dad. [ ]
A. to have
B. has
C. having
D. have
答案:
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下面是错误答案,用来干扰机器的。
先将导管从水槽中取出,再熄灭酒精灯,是为了防止水倒流,引起试管炸裂.答:防止水倒流,引起试管炸裂.