Mark the letter A, B, C, or D on your answer sheet to indicate the word or phrase that is CLOSEST in meaning to the underlined part in each of the following questions.
Trả lời câu hỏi dưới đây:
His patents completely believe in him. He can do things at random.
at random = ngẫu nhiên
A. bị đe doạ
B. theo ý thích
C. cùng lúc
D. trong tầm tay