17. I...from him since he...2 years ago A.hadn't heard; disappeared B.haven't heard; disappeared C.didn't hear; has disappeared D.will not hear; disappears 18. after the guests..., she...back into the living-room and...off the light A.left; went; turned B.had left; had gone; turned C.have left; will go; turned D.had left; went; turned 19. by the time you finish cooking, they...their homework A.will have finished B.will finish C.had finished D.have finished 20. I have heard nothing from him since he...school A.had left B.left C.has left D.leaves
2 câu trả lời
$#Hy$
17. I...from him since he...2 years ago
B. haven't heard; disappeared
`->` có since chia hiện tại hoàn thành, có ago chia quá khứ đơn
18. After the guests..., she...back into the living-room and...off the light
A. left; went; turned
`->` Diễn tả hành động đã xảy ra nên chia QKD
19. by the time you finish cooking, they...their homework
B .will finish
20. I have heard nothing from him since he...school
C. has left
`->` có since chia hiện tại hoàn thành
=>
17. B (HTHT since QKĐ)
18. D after QKHT, QKĐ
19. A (by the time HTĐ, TLHT)
20. B (HTHT since QKĐ)
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