Only when    to explain  thereasonfor this.
A．didhestart;she realizedB．hestarted;didsherealize
C．didhe start;she hadrealizedD．hestarted;hadsherealized
B
考查倒裝句。Only放在句首且強(qiáng)調(diào)狀語(yǔ)時(shí)，后面的主句要使用部分倒裝句。本題中的when he started to explain是一個(gè)時(shí)間狀語(yǔ)從句。結(jié)合句意可知B正確。句意：只有當(dāng)他開(kāi)始解釋的時(shí)候她才意識(shí)到這個(gè)的原因。
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