单项选择题

He is said to （） the old couple for more than ten years.

A．have looking after
B．be looking after
C．look for
D．have been looking after

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单项选择题
But you have to study hard, （）

A．mustn't you
B．won't you
C．don't you
D．oughtn't
单项选择题
Three days later, word came （） our country had sent up another man—made satellite.

A．when
B．which
C．that
D．where
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