the problem is difficult ___ .

the problem is difficult ___ . The problem is difficult ______. The math problem is so difficult that he can't___ ___ ___.他算 Though the math problem is very difficult, the smart boy ___ She was worked out the difficult problem ___ clever she is 单项选择1.The math problem is interesting ___ difficult.A.and B. 初中英语34.---the maths problem is very difficult.Can you ___?-- This maths problem is too difficult.___ of the students can The Math problem is too difficult , we really don’t know ___ The problem is difficult ________.3Q The problem is very difficult to ( ) The problem is () difficult for us()