有人問了我這道有點(diǎn)難的語法題，大家可以先思考一下：
英語中有個(gè)虛擬語氣的句型“要不是...若不是...”——if it weren't for...
比如：If it weren't for you, I wouldn't be successful.（若不是你，我 不會(huì)成功。*事實(shí)上我成功了，而且歸功于你。）
另外，這個(gè)句型還可以用倒裝：Were it not for...，上述句子可以改成：
Were it not for you, I wouldn't be successful.
虛擬語氣的句型有個(gè)特點(diǎn)，時(shí)態(tài)要“退一格”，比如用過去時(shí)表跟現(xiàn)在情況相反，用過去完成時(shí)表跟過去情況相反。
所以 If it weren't for you 和 Were it not for you 都屬于跟現(xiàn)在情況相反，如果要表達(dá)跟過去相反的假設(shè)，要調(diào)整為 If it had not been for...或倒裝 Had it not been for...
但從句的形式要與主句的形式相匹配：
If it weren't for...的主干句應(yīng)是 woud+do
If it had not been for...的主干句應(yīng)是 would have done
來看圖中的句子（...）for your help, we'd never have been able to finish the project on time.（若不是你，我不可能按時(shí)完成這項(xiàng)任務(wù)。）
因?yàn)橹鞲删溆昧恕皐ould have done“的形式，所以是一個(gè)跟過去相反的虛擬語氣，所以從句也要相應(yīng)地用 If it had not been for 或者 Had it not been for。
對(duì)照一下選項(xiàng)，應(yīng)該選 B。
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