Only after they had carried out over ten experiments ______ the decision.
A．they reachedB．they reachC．did they reachD．do they reach
C

這題考查部分倒裝句的用法，當“only+狀語”位于句首時，主句用部分倒裝，即把助動詞、情態(tài)動詞、be動詞放在主語前面，另外注意前面的過去完成時，橫線處用過去時，所以選C。
句意是：只有在他們做了十個實驗后，才下了決定。
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