Does he remember what he was doing _______

单选题 Does he remember what he was doing ________ ?

A．by the time
B．just in time
C．in no time
D．at the time

参考答案D

解析:
考查介词短语。By the time到……时候，just in time刚好，in no time很快地，at the time那时。选项D是正确的。【句子大意】他还记得当时他在干什么吗?

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单选题根据下面内容，回答题：
Scientists in the UK have announced that the piranhafish's reputation 21 a fearsome 22 may well not be deserved. The fish, which is found in the Amazon in Brazil, have been 23 as deadly carnivores( 食肉动物 ) that work in shoals to overwhelm their prey and strip it of its flesh in seconds.
However, experts 24 St Andrews University say that piranhas are omnivores(杂食动物) that mainly eat fish, plants and insects. They form big groups not to hunt but to defend 25 against other predators, according to the team.
"Previously it was thought piranhas shoaled as it 26 them to form a cooperative hunting group," said Professor Anne Magurran. " 27, we have found that it is primarily a defensive behavior. "
Piranhas can be attacked by animals 28 dolphins, caimans and large fish, so forming a shoal is a good way of 29 being killed. Piranhas of 30 age stay in the middle of the group for 31 and the 32 of the shoal differs according to the level of 33 When the water level is 34, the fish form small groups as there is space to escape, but when the water level drops, they form large groups as protection 35 predators.

A．as
B．as if
C．as though
D．since

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单选题

A．kill
B．killer
C．murderer
D．murder

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单选题

A．told
B．saying
C．describing
D．portrayed

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