Before the details had been worked out, they had to make a(n)___

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】：unspecified不明确的。transient短暂的，临时的。tentative不确定的，暂定的。indeterminate不确定的，难以识别的。句意：在细节还没弄清楚之前，他们不得不做一个临时的会议计划。