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题型：单选题题类：常考题难易度：容易

— Whose is this blue bike?
—It ________ be Mary's. Her bike is black and white.

A、must B、can't C、can D、mustn't

举一反三

If you wish , you _________ come in and have a cup of coffee.

—Look, Jim is talking to his friend under the tree.

—It _______ be him. He has _______ back to Canada.

—Who is our new math teacher?

—It ____ be the one with long curly hair. I am not sure.

According to the law, traffic keep to the left in England.

When a virus comes into our body, we get ill. The same thing also happen to a computer.

Jean ___have kept his promise. I wonder why he changed his idea.

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