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重要程度：★★★★☆ 難易程度：★★★☆☆
(2015·湖南) Only after talking to two students that having strong motivation is one of the biggest factors in reaching goals.
A. I did discover
B. did I discover
C. I discovered
D. discovered
【參考答案】B
【拓展延伸】
＂only+狀語從句＂或＂only+狀語（副詞/介詞短語）＂提至句首強調方式狀語、條件狀語、地點狀語、時間狀語等狀語時，後面的句子或主句要用部分倒裝，即把句中的情態動詞、助動詞或系動詞be提到主語的前面。
☛Only then did I realize I was wrong. 只有到那時我才意識到我錯了。
☛Only by this means can you make greater progress in your work. 只有這樣你才能在工作中取得更大的進步。
【易錯提醒】
1. only修飾的狀語可以是副詞、介詞短語，也可以是狀語從句，如果only修飾的是狀語從句，主句用倒裝，從句本身不倒裝。
☛Only when he is seriously ill does he ever stay in hospital.只有當他病情嚴重時他才住院。
2. only修飾主語時，不用倒裝。
☛Only you can persuade him not to smoke. 只有你才能說服他不吸菸。
3. only和修飾的狀語如果不在句首，則不用倒裝。
☛The boy was rescued only when his father arrived in a hurry. 那個男孩在父親匆忙趕到後才獲救。
1. (2015·天津)Only when Lily walked into the office __________ that she had left the contract at home.
A. she realized
B. has she realized
C. she has realized
D. did she realize
2. (2014·湖南) Only when you can find peace in your heart good relationships with others.
A. will you keep
B. you will keep
C. you kept
D. did you keep
3. Only then we decide to answer violence with violence.(單句改錯)
3. then後加did 【解析】考查倒裝句。此句＂Only then＂位於句首，主句子需倒裝，應在主語前加did，故加did。