—I’m afraid not.Some problems were not as easy as they 　　　.

A. supposed B. supposed to be

C. were supposed to be D. were supposed to

【答案】C

【解析】

考查固定搭配与省略。句意：――你昨天数学考试考得好吗？――恐怕不好，有些问题不像他们想象的那么容易。be supposed to do意为“应当，理应”,承接前文省略的不定式后有be时，不定式符号to后要保留be，故选C项。