We agreed to sign the contract, the only ( ) being that it would run for at least five years.

　　A.stereotype

　　B.stethoscope

　　C.stimulation

　　D.stipulation

　　【答案】D。名词辨析。A 项：刻板印象;B 项：听诊器;C 项：刺激;D 项：规定。句意：我们同意签合同，唯一的规定是它至少要持续五年。故本题正确答案选 D。