Question:

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

AIf

BUnless

CThough

DTill

Answer:

B. Unless

Explanation:

'Unless' is a subordinating conjunction.


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She looks ..... your sister.

No sooner _____ i closed my eyes than i fell asleep.

He failed ____ his best efforts.

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The train was late. ________ I managed to arrive on time.