6、Despite the great success of Change-1, experts say, it will be at least ten years    our astronauts can land on the moon.

A．while        B．before       C．since        D．until

6、B

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Despite the great success of Change-1, experts say, it will be at least ten years    our astronauts can land on the moon.

A．while        B．before       C．since        D．until

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