Question

I am used to ____ in queues​

Answer 1

Answer:

I am used to standing in queues.

Answer 2

The complete question is:

Choose the most appropriate word to fill in the blank.

I am used to ____ in queues​.

A. stand B. standing C. stand up D. standing still

The correct option is 'standing'.

I am used to standing in queues.

* In the given sentence, it talks about a usual habit or trend.

Hence, we have used the present continuous tense to represent a continuous habit.

* Also the words 'used to' together make a phrase and need to be followed by the present continuous form of a verb.

The other options are thus grammatically incorrect.