Rewrite: “If he does not pay careful attention to lessons, he cannot keep pace with his classmates.”
A. Unless he pays careful attention to lessons, he cannot keep pace with his classmates.
B. Unless he pays careful attention to lessons, he can keep pace with his classmates.
C. Unless he does not pay careful attention to lessons, he cannot keep pace with his classmates
D. If he pays careful attention to lessons, he cannot keep pace with his classmates
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