Only then did he             the effects of his action.
A．a(chǎn)wareB．a(chǎn)ware ofC．become awareD．become aware of
D
根據(jù)題中only放在句首，主句用倒裝結(jié)構(gòu)did he，可知主句用動詞詞組，故用become aware of知道，意識到，選D。
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