(单选题)

—What do you think of the project Mr. Smith asked us to do?
—Well, it is a very important task. You ______ be too careful.

A.must

B.can

C.cannot

D.mustn’t

参考答案：C

参考解析：

考查情态动词其他。句意：“史密斯先生让我们做的项目你觉得怎么样？”“这是一件非常重要的任务，你再怎么小心也不为过。”must意为“必须”；can意为“能够”；mustn’t意为“禁止”；can’t...too...为固定用法，意为“再怎么样……都不为过”。故选C。

知识点：

—What do you think of the project Mr. Smith asked us to do?—Well, it is a very important task. You ______ be too careful.