单选题：—There's someone knocking on the door．Whoit be?—It must be..

题目内容：

—There's someone knocking on the door．Whoit be?
—It must be Mary．She promised to be here at 8：00．A．mustB．canC．shall D．need

参考答案：

— Do you like the material? — Yes, it _____ very soft.[ ]A..

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