–Listen!Helenissinginginthenextroom. --It     beHelen.S...

问题详情：

–Listen! Helen is singing in the next room.

  -- It      be Helen. She has gone to Guangzhou.

   A. would                  B. can’t

   C. could                   D. might

【回答】

B

知识点：情态动词

题型：选择题