单项选择题

The national Education Department says school safety has set off alarm bells with frequent serious accidents ()injured or even killed.

A. that
B. in which
C. by which
D. when

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单项选择题
-- ()the new housemaid cook some supper for you, Tom --No, tell her I'll eat outside tonight.

A. Shall
B. Would
C. Will
D. Could
单项选择题
I was spending my holidays at the time, so I have no idea how it()

A. was happening
B. happened
C. happens
D. has happened
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