单项选择题

Small children can not （） the different between right and wrong.

A．appreciate
B．confess
C．enjoy
D．acknowledge

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单项选择题
Tom didn't go to the party last night because he （） the baby for his sister until 10:50.

A．had to look after
B．should have looked after
C．would have to look after
D．must have looked after
单项选择题
Scientists cannot （） the appearance of SARS so far.

A．account on
B．account for
C．account about
D．account with
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