He behaved           nothing had happened.
A．even thoughB．becauseC．a(chǎn)lthoughD．a(chǎn)s though
D

試題分析：考查連詞：A. even though即使，B. because因為，C. although雖然，D. as though好像，句意：他表現(xiàn)的好像什么都沒有發(fā)生過。選D。
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