单项选择题

______, both his father and mother died.

A. At the age of six

B. Being six years old
C. He was six years old

D. When he was six years old
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The British constitution is ______ a large extent a product of the historical events described above.
A. at
B. within
C. by
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单项选择题
My wife said in her letter that she would appreciate ______ from you sometime.
A. to have heard
B. to hear
C. having heard
D. hearing
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