题目

阅读下面短文，用括号内所给动词的适当形式填空，必要时可加助动词。 Tim and Gina arebrother and sister. They (be) in China with their parents. It's Friday. Timand Gina 2. (go) toschool at 7: 30. They (have) four classes in the morning and two in theafternoon. Tim (like) math very much. But Gina (not love) it. She (think) it is difficult. At 12: 00, they have lunch. They usually finish (eat) lunch at 12: 30. Their last lesson (finish) at 4: 00 p.m. Afterschool, they (do) sports. Tim likes (play) soccer and Gina likesvolleyball. They go home at 6: 00 p.m.若二项式的展开式中各项系数的和是512，则展开式中的常数项为A.-27C93B.27C93C.-9C94D.9C94