Theystudiedwhatsince2007andfou

They studied what ______ since 2007 and found Australian electricity prices were among the highest in the developed world.

A．has happened

B．happened

C．had happened

D．has been happening

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相关试题

___________, he would have been fired.

A．Had he lied to the boss	B．Did he lie to the boss
C．If he has lied to the boss	D．If he lies to the boss

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．After his retirement, John fishing as one of his new hobbies.

A．took over

B．took in

C．took for

D．took up

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．In this workshop, the output of July was three times __________ of January.

A．that

B．this

C．one

D．it

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.Leonardo da Vince_____birds kept in cages in order to have the pleasure of setting them free.

A．is said to be buying	B．is said to have bought
C．had said to buy	D．who said to have bought

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— What made Bill so angry?
— ______. His girl friend promised to come at 8:30, but she hasn’t come yet.

A．Having kept waiting	B．Being kept waiting
C．To be keeping wait	D．Being kept waited

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