难度：★ 考点：介词的使用
1.-Thanks ______ joining the Talk Show!
-You're welcome.
A. by B. on C. of D. for
2.Sam likes trekking_______the jungle, because he thinks it's exciting.
A.over B.under C.across D.through
3. The 30th Olympic Games will be held in London ______ about six weeks this year.
A. at B. on C. after D. in
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