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9．I will visit Austria ______ the invitation of my friend this summer vacation．（　　）

A．

B．

for

C．

D．

分析今年暑假，在朋友的邀請下我將去拜訪奧地利．

解答答案：D．
考查介詞．根據句意，at the invitation of sb．意為"在某人的邀請下"，屬于固定用法．

點評本題考查介詞的用法．介詞出現在很多固定短語中幫助其豐富含義，而且一般情況下固定短語當中的介詞是不可以換掉或刪減的，所以平時學習中應多加積累，豐富知識．

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