The children will start playing again _______.

  A. by the time they finished their snacks.      

B. after they finish their snacks.

  C. when they finished their snacks.     

D. as soon as they had finished their snacks.

B

Kiến thức: Sự hòa hợp thì

Giải thích:

TLĐ + liên từ + HTĐ/HTHT

Dịch nghĩa: Bọn trẻ sẽ bắt đầu chơi lại sau khi ăn nhẹ xong.