成人英语三级考试

【单选题】It is extremely urgent that they ______ from the mountain before dark.
A. must be rescued
B. should rescue
C. can be rescued
D. be rescued

网考网参考答案：D
网考网解析：
[分析] 在句型“It is urgent/necessary/important+从句”中，从句中要用虚拟语气，其构成是：should do，可以将 should省略。 查看试题解析出处>>