【题目】The first thing you must remember is that in order to succeed, it is almost compulsory that you ______ optimistic.
A.be
B.are
C.must be
D.have been

【答案】A
【解析】考查固定句式。It is necessary/ compulsory/ important/strange that 主语+(should)+动词原形+其他。句意：你必须记住的第一件事就是为了成功你一定要乐观。故选A。