6. The engineering team had experienced several ___________ in the development of the new technology before its success.
(A)setbacks
(B)fallbacks
(C) kickoffs
(D) payoffs

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統計: A(65), B(39), C(8), D(8), E(0) #1676253

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#2454131
setbacksn. 挫折;周折(set...
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