Adam behaved _________ he had never heard such a thing before.
A．in caseB．a(chǎn)s ifC．whileD．though
B

試題分析：考查連詞：A. in case以防，B. as if如果，C. while雖然，當(dāng)…時候，然而，D. though雖然，句意：Adam表現(xiàn)的象從來沒有發(fā)生過這樣的事情。選B。
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