The little girl crossed a large area of grassland into the woods _________ she realized that she was lost.
A．whenB．a(chǎn)sC．a(chǎn)fterD．before
D
考察before特殊用法。Before在…之前；…以后；結(jié)合句意可知D正確；句意：那個小女孩走過一大片草地進(jìn)入森林以后才發(fā)現(xiàn)自己迷路了。
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