Before the details had been worked out, they had to make a(n)( )plan for the conference.
A、unspecified
B、transient
C、tentative
D、indeterminate
【正确答案】:C
【题目解析】:本题考查形容词辨析。unspecified:未说明的,不明确的;transient:短暂的,临时的;tentative:试验性的,暂定的(tentative plan表示初步计划,试验性计划);indeterminate:模糊的,难以识别的。句意:在细节尚未确定之前,他们必须为会议制定一个初步计划。故C选项符合题意。