276.Years ago we didn't know this, but recent science ____ that people who don't sleep well soon get ill. A. showed
B. has shown
C. will show
D. is showing 〖答案〗B
〖考点〗本题考查时态。
〖解析〗由表示对照的Years ago和recent可知, “以前不知”, 但“现在已经证明了”, 所以用现在完成时。The policeman's attention was suddenly caught by a small box which ______ placed under the Minister's car. A. has been
B. was being
C. had been
D. would be 〖答案〗C
〖考点〗本题考查时态。
〖解析〗因为这个小盒子“被放在部长车下”发生在“引起警察注意”之前, 即“过去的过去”, 所以用过去完成时。When the old man ______ to walk back to his house ,the sun _____ itself behind the mountain. A. started ;had already hidden
B. had started ;had already hidden C. had started ;was hiding
D. was starting; hid 〖答案〗A
〖考点〗考查动词时态。
〖解析〗主句的动作在前, 从句的动作在后, 从句中谓语动词 started to walk back表示过去时间点, 因此主句的动作应用过去完成时。
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