Tổng hợp đề thi thử tiếng anh thpt quốc gia (Đề số 20)

By 1820, there were over sixty steamboats on the Mississippi river

17/49

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

By 1820, there were over sixty steamboats on the Mississippi river, _________ were quite luxurious.

which many

many of them

many of which

many that

Giải thích

Chọn C