30. People often decide whether to open an e-mail based on the subject line, so choosing one that lets readers know you are addressing their concerns or business issues.
(A)whether to open 
(B)based on 
(C)so choosing 
(D)that lets
(E)are addressing

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統計: A(6), B(7), C(37), D(5), E(14) #2277052

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    so 是對等連接詞,前面是完整句...
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