问题
选择题
The book __ by him is difficult __.
A．wrote; understanding
B．written; to be understood
C．writing; understand
D．written; to understand
答案
答案：D
考查非谓语动词，第一空是过去分词作定语用written，difficult后用不定式主动表被动。句意：被他写的这本书很难理解。所以选D。