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问题
计算题
9的4倍是多少?
答案
9×4=36
选择题
E-mail English is a new kind of written English that _____ to save time.
A. be being used
B. was being used
C. being used
D. is being used
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填空题
煅烧炉向尾部窜动的原因是()或()。
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