问题补充：
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
答案：
(答案→)A. all that
B. all what
C. which
D. all which
解析： 考查句型：do all (that) sb can to do sth/ do what sb can to do sth尽某人所能去做某事，所以应选A，若选B应去掉all，句意：托尼，我最好的朋友尽他所能帮助我摆脱困境。
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