After several ______ attempts to send the missile into space, the spacecraft was finally launched successfully.

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问题 After several ______ attempts to send the missile into space, the spacecraft was finally launched successfully.

选项 A、abortive
B、difficult
C、experimental
D、preliminary

答案A

解析 (abortive流产的,失败的)。句意为;把导弹发射到太空中去的几次尝试失败以后,宇宙飞船的发射终于取得成功。B.difficult困难的;C.experimental实验性的;D. preliminary预备的,初步的。
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