单项选择题

Even the best student in our class couldn't answer this question, so it （）be very difficult.

A．must
B．could
C．may
D．can

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单项选择题
You'll find this map of great （）in helping you to get round London.

A．price
B．cost
C．value
D．usefulness
单项选择题
Please make my excuse at tomorrow's meeting. I've got too much work （）.

A．to do to come
B．doing coming
C．to do coming
D．doing to come
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