单项选择题

Was it is 1969（）the American astronaut succeeded（）landing on the moon

A．when, on
B．that, on
C．where, in
D．that, in

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单项选择题
I don't think Frank is（）engineer as Bill.

A．as able an
B．able as an
C．as an able
D．an as able
单项选择题
（）he comes, we will be able to go.

A．Without
B．Unless
C．Except
D．Even
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