We __________ (test) the new machine when the electricity __________ (go) off.这个是过去进行时的练习!

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We__________(test)thenewmachinewhentheelectricity__________(go)off.这个是过去进行时的练习!We__________(test)the

We __________ (test) the new machine when the electricity __________ (go) off.这个是过去进行时的练习!
We __________ (test) the new machine when the electricity __________ (go) off.
这个是过去进行时的练习!

We __________ (test) the new machine when the electricity __________ (go) off.这个是过去进行时的练习!
肯定是 were testing
went

are testing
goes

第一个 will test
第二个 goes

tested
went