Not until then _____ their marriage was breaking up because they had little in common.
A．did I realize B．I realizedC．had I realizeD．has I realized
A
考查倒裝結(jié)構(gòu)。否定詞not until放在句首，主句的主謂要倒裝，根據(jù)句意用一般過去時，選A。
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