Look! The light in the room is still on. Mr. Liu at work.

题型：单选题题类：模拟题难易度：普通

A、must B、can't be C、must be D、have to be

举一反三

— No, you ________. You ________ to leave until the bell rings.

—Because I am able to do it by myself.

— It ________ be him, for he ________ Australia since last Thursday and hasn't returned.

The soccer ball {#blank#}1{#/blank#} be John's or Tony's. They both play soccer.

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