电力系统有功功率的经济分配问题主要包括有功功率电源的最优组合和有功功率负荷的最优分配两个方面。
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You’d better take some notes before you __________ it.
A. are forgetting
B. forget
C. will forget
D. forgot
This is the first time that I __________ Beijing.
A. visited
B. have visited
C. ad visited
D. am visiting
I’ll go to the party as soon as I ______ my homework.
A. will finish
B. finish
C. had finished
D. finished
He said that he ___________ a computer very soon.
A. will buy
B. had bough
C. would buy
D. bought
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