It has already been visited b___ man from the Earth.Man-made

It has already been visited b___ man from the Earth.Man-made satellites have been sent up i_ space
by many countries.

bravenessQ 1年前已收到2个回答举报

清雅秋幼苗

共回答了16个问题采纳率：87.5% 举报

y
into
.

1年前

药师丹枫幼苗

共回答了63个问题举报

这应该是使用适当介词填空的一道题目，应该填by和into。

根据语境，主语it应该是指某一颗星球，比如月球。

它（这颗星球）已经被地球人访问过了。by表示被动，后面加动作的发出者。
人造飞船已经被发射到太空中了。set up into space，表示飞船或卫星被发射到太空中。
man-made satellite是人造卫星的意思。...

1年前

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