Researchers worked with 135 second-grade students at a school in Los Angeles after

Researchers worked with 135 second-grade students at a school in Los Angeles after (2) _________a pilot study with 102 students.

A. composing

B. concerning

C. conducting

D. carrying

Trả lời

Ta có cụm từ cố định conduct a study (tiến hành nghiên cứu)

Chọn C.

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