单项选择题

______, it is quite easy to drill a hole in it with laser.

A. Hard although a diamond is
B. As a diamond is hard
C. Hard as a diamond is
D. How hard is a diamond
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______ a fine day, we decided to go for a picnic.
A. Having been
B. Being
C. What
D. It being
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When she heard the bad news, her eyes ______ with tears as she struggled to control her emotions.
A. sparkled
B. twinkled
C. radiated
D. glittered
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