单项选择题

______ is believing.

A．Seeing
B．Seen
C．To be seeing
D．To see
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单项选择题
Half of those books ______ best-sellers.
A．is
B．are
C．am
D．was
单项选择题
She can't find money for life necessities, ______ such luxuries as jewelry and perfume.
A．leave alone
B．leave well alone
C．let well along
D．let alone
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