The metaphor in this statement is "the great millstone" it kind of qualification word it express how big the time was.
But in reality, millstone doesn't even have a relationship with the time.
So "the great millstone" is a metaphor.
1 <u>gav</u>e
2 were speaking
3 What did you cook for dinner?
4 At midnight we were sleeping.
5 Yesterday at this time Luis was taking a test.
1 Their mother came home while they were in Montreal
2 Juan hurt his ankle while he was clearing the house.
3 I was reading my emails when they saw two police cars.
4 It was snowing when I got your text.
5 They were driving home when I was playing baseball.
1 I don’t like this song. I <u>have heard</u> it too many times!
2 Sergio and Alexis <u>went</u> to the game last night.
3 Mr. Williams <u>has not bought </u>a new car for a long time.
4 Valeria <u>has not done</u> her homework yet.
5 Charlie <u>was</u> seven years old when he moved here.
1 How hard it is?
2 How old is she?
3 How well did she do?
4 How young is he?
5 How often does he play soccer?
hope this helps (^▽^)
Difficult could mean stubborn. Difficult can also mean hard.
personally think 'a' is the best answer