单项选择题

Neither John nor I ______ able to persuade Richard"s grandfather to attend the wedding.

A．am
B．are
C．are to be
D．is
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单项选择题
______ under a microscope, a fresh snowflake (雪花) has a delicate six-pointed shape.
A．Seeing
B．Seen
C．To see
D．To be seen
单项选择题
We ll be only too glad to attend your party ______ we can get a baby-sitter.
A．so far as
B．provided that
C．unless
D．except that
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