Question

The boy over there is the only one of the students who ________ to Europe．

1. A.
   has been
2. B.
   have been
3. C.
   has gone
4. D.
   have gone

Answer 1

A
思路解析：over there說明the boy就在眼前，因此排除C、D兩項；先行詞是the only one of the students，是一個人，因此答案是A項。
綠色通道：要熟記各種學過的詞匯、句型�？梢院唵蔚赜洖椋骸皁ne of the+可數名詞復數”作先行詞時，定語從句謂語動詞用復數；“the only one of +可數名詞復數”作先行詞時，定語從句謂語動詞用單數。