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问题: please help me slove some question,very thanks!

1.It is not when to do it but how to do it _____ is of vital importance.
A.it B.this C.that D.which
2.--I'll go there alone this weekend.
--You'll regret ____ the decision.
A.to make B.making C.make D.have made
3.--I can't believe my ex-girlfriend has a new boyfriend already.
--I ___ have told you she'd be there with him.
A.would B.should C.must D.could

解答:

答案如下:
1:C 强调句型
2:B regret to do 表示遗憾去做某事
regret doing 表示后悔做了某事
3:B shuold have done 虚拟语气 本该告诉你