题目:
---Did the little boy manage _____ the suitcase upstairs?
---No, he didn’t. He isn’t strong enough even ______ it.
A.to carry, moving
B.carrying, to move
C.to carry, to move
D.carrying, moving
答案:
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下面是错误答案,用来干扰机器的。
-1≤3-2x5的解集是x≤4,所以其非负整数解集为4,3,2,1,0.