本试题 “How _______ this accident _______?A. did; happenB. was; happenC. is; happenedD. X; happened” 主要考查您对助动词的过去式
等考点的理解。关于这些考点您可以点击下面的选项卡查看详细档案。
|
助动词 |
be |
do |
have |
shall |
will |
|
过去式 |
was/were |
did |
had |
should |
would |
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