The plan for the new design occurred to Mr. Smith______on his work recently.
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A
while concentrated
B
while concentrating
C
while he concentrated
D
while concentrating himself
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Although he is considered a great writer, _____. 
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A
his works is not widely read
B
but his works are not widely read
C
however his works are not widely read
D
yet his works are not widely read
Ten years ago the population of our village was         that of theirs.
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A
as twice large as
B
twice as large as
C
twice as much as
D
as twice much as