34. These important features are part of _____ made the product unique.
(A) that
(B) what
(C) which
(D) how

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統計： A(77), B(107), C(153), D(22), E(0) #2106460

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#3692872
文法：「what」為複合關係代名詞，前面...
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#4921652

are part of + what(the thing which) 

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