— The plane won't take off _______________ the thick clouds move away. — Let's wait patiently for the environment from

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1. — The plane won't take off _______________ the thick clouds move away.
— Let's wait patiently for the environment from the airport.

A . since B . although C . while D . until

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北师大版初中英语八年级下册Unit 2 Lesson 6 The Texting Generation第5课时