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，后面使用部分倒裝的形式。句意：只有在那時瑪麗才知道她已經(jīng)浪費了多少時間。
點評：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，后面使用部分倒裝的形式。
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