( ) 30 ---Where’s Mary?I can’t find her.--- She _______ at the pool.A.swimming B.is swimming C.swim D.swims 选什么？为什么？

( ) 30 ---Where’s Mary?I can’t find her.--- She _______ at the pool.A.swimming B.is swimming C.swim D.swims 选什么？为什么？
( ) 30 ---Where’s Mary?I can’t find her.--- She _______ at the pool.A.swimming
B.is swimming C.swim D.swims 选什么？为什么？

( ) 30 ---Where’s Mary?I can’t find her.--- She _______ at the pool.A.swimming B.is swimming C.swim D.swims 选什么？为什么？
选B 玛丽在哪里?我可以找到她.她正在水池中游泳.用现在进行时表示正在做的事情.

is swimming

is

is swimming

正在进行时 b 仅供参考

B，她正在游泳池里游泳