单项选择题

() his address, I can't send this book to him.

A.Not knowing
B.Knowing
C.Not know
D.N6t known

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单项选择题
Goodbye, Mr. Smith. I'm very pleased ().

A.to meet you
B.to have met you
C.meeting
D.having met you
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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