Can you write . . . . . . . . this pen? A. by B. in C. with D. on

The correct answer is C. with.

The other options are incorrect because:

• A. by is not a preposition that is commonly used with the verb “write.”
• B. in is a preposition that is commonly used with the verb “write” when referring to a specific location, such as “write in a journal” or “write in a book.” However, it is not commonly used with the verb “write” when referring to a pen.
• D. on is a preposition that is commonly used with the verb “write” when referring to a surface, such as “write on a piece of paper” or “write on a chalkboard.” However, it is not commonly used with the verb “write” when referring to a pen.

The verb “write” can be used with a variety of prepositions, depending on the context. In the sentence “Can you write with this pen?” the preposition “with” is used to indicate that the pen is the instrument that will be used to write.