Question

【题目】This Russian program is difficult ______ for Chinese students.
A.understanding it
B.understanding
C.to be understood
D.to understand

Answer 1

【答案】D
【解析】考查不定式。句意：这个俄语程序对中国学生来说很难理解。此处是不定式做定语应用主动形式表示被动，故选D。