单选题
With his brows knitted, the doctor contemplated the difficult operation he had to perform.
【正确答案】
D
【答案解析】[解析] 本题中，contemplated意为“凝视，沉思，预期，企图”。四个选项中，thought deeply about意为“深思”；succeeded in意为“在……方面成功”；decided against意为“决定不做某事”；went on with意为“继续做某事”。只有D项符合题意。