A: What’s the matter Sara? You wear a sad look on your face. B: Oh nothing much. As a ma

问题补充：

A: What’s the matter, Sara? You wear a sad look on your face.

B: Oh, nothing much. As a matter of fact, I of my friends back home.

A. just thought

B. have just been thinking

C. was just thinking

D. have just thought

答案：

A. just thought

B. have just been thinking

(答案→)C. was just thinking

D. have just thought

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