单项选择题

Many things（）impossible in the past are common today.

A．to consider
B．considering
C．being considered
D．considered

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单项选择题
The Yellow River is（）river in China.

A．the longest
B．the second longest
C．second longer
D．the second longer
单项选择题
I'll lend you my computer（）you promise to take care of it.

A．unless
B．while
C．as
D．if
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