_puzzles me now is that we don't know _we'll major

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_puzzles me now is that we don't know _we'll major
_puzzles me now is that we don't know _we'll major

_puzzles me now is that we don't know _we'll major
What what
前面一个,what引导的小分句做句子的主语,可以看作是主语从句,从句中缺少主语,所以只能用what来引导;
后面一个,what引导宾语从句,做know的宾语,句中缺少宾语成分,所以仍然只能用what来引导.

what which
第一空为主语从句缺主语,一定填what,后者为宾语从句,缺宾语,which做宾语。