单项选择题

Mary has got a full mark in the test. She（）very hard all these days.

A．will work
B．may work
C．must have worked
D．could have worked

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单项选择题
When will they leave（）

A．6:30.
B．7:00.
C．7:15.
D．7:30.
单项选择题
Where did Mary buy the dress（）

A．In a Department Store.
B．In a supermarket.
C．In the biggest store.
D．In a small fashion shop.
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