Only when the data again that there was a mistake. A．they had studied,did they r
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Only when________the data again________that there was a mistake.
A．they had studied；did they realize
B．they had studied；realized they
C．had they studied；did they realize
D．had they studied；realized they
试题答案
A
考查倒装。“only＋状语从句”置于句首时，主句用部分倒装，从句不倒装。