Question

I seem ________ him somewhere before, but I can't remember where．

1. A.
   to have seen
2. B.
   to be seeing
3. C.
   seeing
4. D.
   having seen

Answer 1

A
解析：
选择本题答案的关键是首先要明确seem后不能接动名词，可以是从句或介词like或不定式。因此先排除C、D两项。A、B两项中B项是不定式的进行时，而see一般不用作进行时态，结合本题的题意“我似乎在哪儿见过他……”，故用不定式的完成式。