Mark the letter A, B, C, or D on your answer sheet to indicate the cor

Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions.    

___ at the campsite, it had stopped raining.

• A. A. By the time they arriving
• B. B. After they arrived
• C. C. By the time they arrived
• D. D. By the time they arrive

Vế sau chia ở quá khứ hoàn thành -> Vế trước xảy ra trước, ở quá khứ đơn
=> C
Tạm dịch: Khi họ đến nơi, cơn mưa đã dừng.