问题

Tony, my best friend, has done _______ he can to help me out of trouble.

A:all that
B:all what
C:which
D:all which

正确答案是：

同类题型

Our teacher asked me ________.

The two boys________each other in appearance but differ widely in their tastes

__, I’m glad you made that mistake, for it will serve as a warning to you.

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Putting in a new window will ______ cutting away part of the roof.