2000 câu trắc nghiệm tổng hợp Tiếng Anh 2025 có đáp án (Phần 21)

Volunteering can take many forms, from working with children with (4) _____ difficulties, in an animal hospital, or planting trees.

4/71

Volunteering can take many forms, from working with children with (4) _____ difficulties, in an animal hospital, or planting trees.

learn

learned

learning

learnt

Giải thích

c. learning

Giải thích:

giới từ + Ving/N