问题

Have you realized the difficulty we have____ the problem

A:should beblamed
B:to work out
C:work out
D:working out

正确答案是：

同类题型

There is a big dog_______to a fence outsidethe house.

The students, together with their teacher, going to work as volunteers at the bus stations next Sunday.

The 16th Asian Games in Guangzhou from November 12 to November 27,2010

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