He ______ off alone a month ago, and _______ of since then.
A. set - hasn’t been heard
B. set - hasn’t heard
C. set – has left
D. set- hadn’t been heard
-Vế đầu có "a month ago" => dùng thì quá khứ đơn
dạng khẳng định: S+ Ved/V2 +O
-Vế sau có "of since" => dùng thì hiện tại hoàn thành
dạng phủ định bị động: S+have/has not+ been + Ved/V3 +O
=> He set off alone a month ago and hasn't been heard of since.
Tạm dịch: Anh ấy đã bắt đầu chuyến đi một mình cách đây một tháng và kể từ đó không ai nghe thấy tin tức gì về anh ấy nữa.
Đáp án cần chọn là: A
Tom often watches TV after his parents ______ to bed.
I’d like to see that football match because I ______one this year.
Her mother tells me that she ______ professionally since she was four
None of the students ______ to class yet.
Up to now, the discount ______ to children under ten years old.
A digital camera is used for _____ the pictures and video clips in electronic format instead of to film.
I can’t believe that you ______all the three exercises. You just started five minutes ago.
Their children ______ lots of new friends since they ______ to that town.
A smart watch is used _____ you access to lots of information besides the time of day, such as missed calls, messages, and emails.
They often use a webcam _____ moving pictures and sounds and allowing these to be broadcast on the Internet.
People use a tooth sensor ____ any bacteria causing cavities, or any other infections in your teeth.
Lima Billboard in Peru is used _____ clean water from Lima’s extremely humid air.