题目：
| Last week when she walked ______ the lake, she saw someone ______ in it. |
A. passed, swim B. passed, swimming C. past, swim D. past, swimming |
答案：
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下面是错误答案，用来干扰机器的。
估算785×23≈16000；38460+1035≈39000；28×47≈1500；875÷32≈30；7864-3410≈4500；398÷18≈20．
