8. Tom ________ into the house when no one _________ .A. slipped; had looked B. has slipped; lookedC. slipped; had looked D. was slipping; looked或者是不是有其他更佳答案?

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8.Tom________intothehousewhennoone_________.A.slipped;hadlookedB.hasslipped;lookedC.slipped;hadlooke

8. Tom ________ into the house when no one _________ .A. slipped; had looked B. has slipped; lookedC. slipped; had looked D. was slipping; looked或者是不是有其他更佳答案?
8. Tom ________ into the house when no one _________ .
A. slipped; had looked B. has slipped; looked
C. slipped; had looked D. was slipping; looked
或者是不是有其他更佳答案?

8. Tom ________ into the house when no one _________ .A. slipped; had looked B. has slipped; lookedC. slipped; had looked D. was slipping; looked或者是不是有其他更佳答案?
选 D
主句用过去进行时,when引导的时间从句用一般过去时.

B

D

D. was slipping; looked