25.6-9.8=25.6-10+0.2．______．
25.6-9.8．
=25.6-（10-0.2），
=25.6-10+0.2；
故答案为：正确．
The telephone _____ three times in the last hour, and each time it _____ for my sister.
A．had rung; was
B．has rung; was
C．rang; has been
D．has been ringing; is
商业助学贷款业务中，每笔贷款可展期（）次。
A.4
B.1
C.2
D.3
