问题
选择题
I have to turn to my teacher for help, because this math problem is rather difficult______.
A．worked out
B．to be worked out
C．working out
D．to work out
答案
答案：D
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I have to turn to my teacher for help, because this math problem is rather difficult______.
A．worked out
B．to be worked out
C．working out
D．to work out
答案：D