【题目】Thank you for your timely help; otherwise we in great trouble now.
A.must have been
B.would have been
C.would be
D.must be

【答案】C
【解析】考查虚拟语气。句意：感谢你的及时帮助，否则我们现在会有大麻烦。根据“now”可知对现在事实虚拟，故使用would+do。故选C。