问题描述：
70 percent of the students here____from the countryside.
A is B are C comes D has come
Your trousers____dirty,Your must have ____washed.
A is,it B are,it C are,them D is,them
The rest of the magazines____within half an hour.
A is sold out B are sold out C was sold out D were sold out
Bill Cliton took____office on January 20th,1993,and became____42nd US President.
A an,the B /,the C /,/ D the,the
A is B are C comes D has come
Your trousers____dirty,Your must have ____washed.
A is,it B are,it C are,them D is,them
The rest of the magazines____within half an hour.
A is sold out B are sold out C was sold out D were sold out
Bill Cliton took____office on January 20th,1993,and became____42nd US President.
A an,the B /,the C /,/ D the,the
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