B. have been searched
Đáp án C
Kiến thức về thì của động từ
Dấu hiệu: all this morning => hiện tại hoàn thành tiếp diễn
Tạm dịch: Tôi đã nghiên cứu để biết thông tin về sự khác biệt giữa giáo dục sau đại học và giáo dục đại học cả sáng nay.
Smoking is extremely detrimental to health, _____ many people continue to smoke anyway.
Many years ago, black children were _____________ to discrimination in many schools.
The authorities recommend that the meeting _____________ next Monday.
As a small boy, he used to _______ alone in the house for an hour or two.
Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions.
We decided to spend ______ summer in ______ seaside town.
Her husband is very kind. He always cares _____ her and never puts all of the housework her.
One member of the project group_______the boss and was fired immediately.
The archaeological excavation _____ to the discovery of the ancient city lasted several years.