This building is both a secret and a mystery. No one shall be admitted into it ______ he can give the right password.
A．ifB．a(chǎn)sC．sinceD．unless
D
考查連詞。句意為這幢樓是一個(gè)秘密和迷。沒有人可以被允許進(jìn)入，除非他可以得到正確的密碼。
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