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With a lot of questions _________, the official is having a hard time.
1年前
若潜水员呼吸一次吸入2L空气,试估算潜水员在海底比在岸上每呼吸一次多吸入空气的分子数.(结果保留一位有效数字)
1年前
I made a call to my parents yesterday, but _______ of them answered it.
1年前
______ is (are) healthy food. [ ]
1年前
Michael Greenberg is a very popular New Yorker.
1年前