问题
选择题
---What is the boy doing?
---He _____________ happily.
A swims B swam C has swum D is swimming
答案
答案：D
问句是：What is the boy doing?说明是用现在进行时，选D。
搜题请搜索小程序“爱下问搜题”
---What is the boy doing?
---He _____________ happily.
A swims B swam C has swum D is swimming
答案：D
问句是：What is the boy doing?说明是用现在进行时，选D。