BY THE TIME A BABY HAS REACHED HIS FIRST BIRTHDAY, HE SHOULD ___ S...

Lớp 12 Tiếng Anh Bài tập tiếng anh lớp 12 theo chuyên đề

10. By the time a baby has reached his first birthday, he should ___ sit up or even stand up.A. to be able to B. able to C. to be able D. be able to