（2015•辽宁丹东）—Who's singing in the garden?—It ________ be Tom. He always practices singing at this time.

题型：单选题题类：真题难易度：普通

—Who's singing in the garden?—It ________ be Tom. He always practices singing at this time.

A、can't B、need C、must D、mustn't

举一反三

--Don't worry. It must be somewhere in your room.

— Must we hand in the exercise-books today?

— No, you {#blank#}1{#/blank#}.

They {#blank#}1{#/blank#} sing {#blank#}2{#/blank#} dance.

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