单项选择题

Metal has many useful properties, of which strength is the most important.（）

A．金属在诸多特性中以强度最为重要。
B．具有强度的金属有多种用途。
C．金属有许多有用性能，其中强度最为重要。
D．金属坚硬耐磨才是其最重要的性能。

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I would have come sooner but I（）that you were waiting for me.

A. didn't know
B. don't know
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The little girl（）dance before so many guests,（）she

A. doesn't dare to; dare
B. daren't does; does
C. dares not; dare
D. daren't; dare
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