—You went to the US last month , didn’t you?

—Yes. That was the first time that I________ there.

A．went

B．had gone

C．had been

D．have been

列式计算：

（1）1.6与1.4的差加上5除6.25的商，和是多少？

（2）3.7与3.3的和除以它们的差，商是多少？