20. _____ in transportation, medieval Europe would not have adopted monetary units of exchange and eliminated the process of bartering.
(A) If there are no improvements
(B) Had there been no improvements
(C) Were there no improvements
(D) If there hadn’t had improvements

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統計： A(6), B(37), C(4), D(10), E(0) #3848042

詳解 (共 2 筆)

#7573071
答：(B)　主要子句使用 would n...
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#7327212

If there had been... 

=Had there been... 
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私人筆記#7921884
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【題目解析】 原文段落： _____ ...
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正確答案是 (B) Had there...
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✦✦✦已幫考友用星等分類重要單字 20....
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