单项选择题

-- There is a bad smell here. -- Oh, dear! I () the gas.

A．must forget turning off
B．must forget to turn off
C．must have forgotten turning off
D．must have forgotten to turn off

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单项选择题
--() may I () the book-- For three weeks.

A．How often; borrow
B．How often; keep
C．How long; borrow
D．How long; keep
单项选择题
She () several jackets and finally picked out a blue one.

A．went on
B．took on
C．tried on
D．put on
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