16. John_________to Japan three times before he graduated from college in 2018.
(A) has gone
(B) has been
(C) had visited
(D) had been

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#6732098
### 題目解析 這題需要選擇一個適當的...
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#6732150
題目解析 這道題目要求填入一個動詞形式,...
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