单项选择题

Was it in 1969 ______ the American astronaut succeed ______ landing on the moon

A．when; on
B．that; on
C．which; in
D．that; in
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单项选择题
I don t think Mary understood what you said, ______
A．do I
B．didn"t she
C．did you
D．did she
单项选择题
You can hardly imagine Belt ______ a meal.
A．to be cooking
B．cooking
C．to cook
D．cook
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