问题
选择题
Don’t be in a hurry. We are supposed ____________ this problem step by step.
A．solving
B．to solving
C．to solve
D．solve
答案
C
题目分析：句意：别着急。我们应该一步步地解决这个问题。in a hurry着急；step by step逐步地；“应该做某事”是“be supposed to do sth.”，所以空格处应该用动词不定式，故选C。
考点：