单项选择题

When he was in his ______ , he began to study English.

A．forty
B．forty's
C．forties
D．forty's years old
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He is ______ a horse.
A．stronger as
B．as stronger than
C．the strong as
D．stronger than
单项选择题
It is a question ______ the book will be published this month or next month.
A．if
B．whether
C．that
D．which
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