Only at that time            how much time she had wasted.
A．Mary did knowB．did Mary knowC．does Mary knowD．Mary does know
B
考查倒裝句。Only 放在句首后接狀語時(shí)，后面使用部分倒裝的形式。句意：只有在那時(shí)瑪麗才知道她已經(jīng)浪費(fèi)了多少時(shí)間。
點(diǎn)評(píng)：注意部分倒裝，完全倒裝的結(jié)構(gòu)和規(guī)則。Only 放在句首后接狀語時(shí)，后面使用部分倒裝的形式。
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