you should have thanked her before you left.I meant____,but when I was leaving I couldyou should have thanked her before you left.I meant____,but when I was leaving I couldn't find her anywhere.A to do B to C doing D doing so为什么不能选A?

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youshouldhavethankedherbeforeyouleft.Imeant____,butwhenIwasleavingIcouldyoushouldhavethankedherbefor

you should have thanked her before you left.I meant____,but when I was leaving I couldyou should have thanked her before you left.I meant____,but when I was leaving I couldn't find her anywhere.A to do B to C doing D doing so为什么不能选A?
you should have thanked her before you left.I meant____,but when I was leaving I could
you should have thanked her before you left.
I meant____,but when I was leaving I couldn't find her anywhere.
A to do B to C doing D doing so
为什么不能选A?

you should have thanked her before you left.I meant____,but when I was leaving I couldyou should have thanked her before you left.I meant____,but when I was leaving I couldn't find her anywhere.A to do B to C doing D doing so为什么不能选A?
B,这是动词不定式的省略形式,后面的do sth一起省略,这里必须要用mean to do而不是doing(前者是“打算做某事”,后者“意思是,意味着”,意思不对)
句子意思是“你应在走之前感谢她
我打算这样做,但是当我要离开时去找不到她”
补充:A的do是一个实义动词,需要加宾语sth的,动词不定式的省略是到to为止的(有时表示过去要加上have),后面 的do sth要一起省

D doing so 我本想这样做。

B
I meant to 意为:我本想那么做(这里:我本想谢谢她!)但实际没有,属于虚拟语气。动词不定式省略至符号to为止。