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―If the traffic hadn’t been so heavy, I could have been back by 6 o’clock.

    ―What a pity! Tina _______ here to see you.

A. is     B. was     C. would be      D. has been

B。


解析:

由句意知，Tina現(xiàn)在已走，剛才在這里等你，因此用一般過去時(shí)。

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　　The new planet is 30 times farther away than any planet discovered by scientists before. It is in the Milky Way (銀河) but it is not in our solar (太陽的) system. The new planet moves around a star much like our sun, however. Scientists discovered the planet by using a new planet-searching method, called “transit technique.” They were able to catch sight of the planet when it moved in front of its star, causing the star's light to dim (變暗). Scientists compare the method to discovering the shadow of a bee flying in front of a searchlight 200 miles away. “We believe the door has been opened wide to go and discover planets like Earth,” says Sasselov.

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