单项选择题

No matter how hard he worked, ______. ( )

A．he could not do any better
B．and he could not do any better
C．so he could not do any better
D．but he could not do any better
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单项选择题
Mother has ______ to give her a watch on her 20th birthday. ( )
A．asked
B．promised
C．allowed
D．advised
单项选择题
Girls are often ______ of snakes ( )
A．afraid
B．fear
C．surprised
D．against
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