John _________ off alone a month ago, and _________ of since then.
A. has set - hasn't heard
Đáp án B
Giải thích:
Dấu hiệu: “a month ago” => chia thì quá khứ đơn ở mệnh đề đầu
“since then” => chia thì hiện tại hoàn thành ở mệnh đề sau
Cấu trúc bị động ở thì hiện tại hoàn thành: S + have/ has + been + P2
Tạm dịch: John đã khởi hành một mình một tháng trước, và kể từ đó không nghe được tin tức gì.
Chọn B.
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