问题
选择题
Generally speaking, the publishers will send you a specimen copy of their new books when ________.
A．requested
B．requesting
C．having requested
D．to be requested
答案
答案：A
本题考查的是“when + 过去分词”作状语。when requested是when it is requested的省略形式。句意为：通常说来，如果需要，出版商会把他们的新书给你寄个样本来。