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问题

Space exploration began in the 1960s, and since then about five hundred people _______ into space. [ ]

A: are traveling
B: traveled
C: had traveled
D: have traveled
正确答案是:
同类题型

making copies at work, and someone came into theroom while talking on his cell phone Should I have left _____ him privacy

Could you please tell me something about Hong Kong Disneyland, please— With pleasure. It ___ an area of 129 hectare, _____ four different parks.

Half of ________ surveyed in 16 countries say they go first to their closest friend to share their deepest wishes and darkest fears

You’d better not phone me tomorrow evening; I ____ an important meeting then

It was only when I reread his poems recently________I began to appreciate their beauty

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