Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct word or phrase that best fits each of the numbered blanks .
A. collected
B. to collect
C. collecting
D. collection
* Đáp án
C
* Hướng dẫn giải
Đáp án C
S+ spend time +Ving=It takes sb time to do something: Ai đó mất bao lâu để làm gì