单项选择题

I don't know about him, ______ comment on him behind his back.

A．let alone
B．let go
C．leave alone
D．take leave
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单项选择题
______ , leaves from certain trees such as the maple turn into bright colours.
A．During the fall
B．With the fall
C．While the fall
D．Along the fall
单项选择题
A holiday in Holland is unlikely to cost very much ______ you stay in the top class luxury hotel.
A．when
B．unless
C．if
D．since
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