题目内容

假设某程序语言的文法如下：S→a｜b｜(T)T→TdS｜S其中：VT=a，b，d，(，)，VNS，T，S是开始符号。考查该文法，称句型(Sd(T)db)是S的一个 (33) ，其中， (34) 是句柄： (35) 是素短语； (36) 是该句型的直接短语； (37) 是短语。（37）处填（）。

A. [Sd(T)db]
B. d(T)
C. Td
D. Sd(T)d

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