从a、b、c、d四个选项中，选出可以填入空白处的最佳选项。
21．ten years ago the population of our village was ________ that of theirs.
a．as twice large as b．twice as large as
c．twice as much as d．as twice much as
22．not having thought of________solution to the problem，he isn’t in________mood for the party tonight.
a．a；the b．the；a
c．a；/ d．the；/
23．
a．to explore b．exploring
c．to be explored d．being explored
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