He was happy to find the kind of job_________

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for which he had trained

which they had trained him for

that he had training for

that was for his training

Giải thích

Đáp án A
“for which he had trained” là cụm mệnh đề quan hệ chỉ công việc mà anh ta được đào tạo;
dùng “for which” là đại từ quan hệ thay thế cho “the kind of job” vì trong mệnh đề quan hệ
vai trò của “the kind of job” là tân ngữ