题目内容

I really don’t want to go tonight and I’m trying to _______an excuse.

A. think out
B. think about
C. think over
D. think up

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In a word, we have no doubt ________ you are perfectly sound in mind and body.

A. that
B. when
C. what
D. whether

At least 76 people died when a Sibir Airlines Tu-154 ________ into the sea about 180kilometers from the Russian resort of Sochi on Thursday.

A. dropped
B. jumped
C. plunged
D. declined

绕组Dd联结的三相变压器的一次侧的额定电流等于()

A. 变压器额定容量除以一次侧额定电压的2的平方根倍
B. 变压器额定容量除以一次侧额定电压的3的平方根倍
C. 变压器额定容量除以二次侧相电压的3倍

________, we’d better make some changes in the plan.

A. That is the case
B. That having been the case
C. That to be the case
D. That being the case

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