Choose the word or the phrase or sentence that best completes each unfinished sentence below or that best keeps the meaning of the original sentence if it is substituted for the underlined word or phrase.
We couldn’t go on a picnic as planned __________ it was raining.
A. however
B. but
C. because
D. so
Đáp án: C
Dịch: Chúng tôi không thể đi dã ngoại theo kế hoạch vì trời đang mưa.