问题
选择题
—Where is Sam?
—He ________ in the river.
A. swims
B. are swimming
C. is swimming
D. is swiming
答案
答案：C
搜题请搜索小程序“爱下问搜题”
—Where is Sam?
—He ________ in the river.
A. swims
B. are swimming
C. is swimming
D. is swiming
答案：C