Challenger

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Question:

_________ you ring the bell , they won't open the door

AIf

BUnless

CThough

DTill

Answer:

B. Unless

Explanation:

'Unless' is a subordinating conjunction.

Related Questions:

I need to call my parents, _____ they won't worry.

We will have to go ___ she comes with us _not.

He failed ____ his best efforts.

The wall was _____ high that I could not reach its top.

Maya knew ______ he needed to hurry up.