单项选择题

I don't know ______ yesterday.

A． why didn't he go to school
B． why he didn't go to school
C． when he didn't go to school
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单项选择题
Thank you ______ the beautiful flowers.
A． to
B． with
C． for
单项选择题
Tom writes as ______ as her sister.
A． carefully
B． more carefully
C． careful
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