Question

The nurse must be very tired ___ she had no sleep last night. ( so , because , after)​

Answer 1

Answer:

because

Explanation:

hope it helped

Answer 2

Answer:

The nurse must be very tired because she had no sleep last night.

Explanation:

$\rightarrow$ We are dealing with conjunctions here.

$\rightarrow$ Conjunctions are the words used to connect two or more sentences as one.

$\rightarrow$ They are also called connectors.