Bộ 5 đề thi cuối kì 2 Tiếng Anh 9 Global Success có đáp án - Đề 1

_______ water does not flow in a zero-gravity environment, the astronauts cannot wash their hands under a faucet.

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_______ water does not flow in a zero-gravity environment, the astronauts cannot wash their hands under a faucet.

Although

If

When

Since

Giải thích

D