He looked quite healthy he was the age of seventy.A. when; atB. because; inC. if; forD.

问题补充：

He looked quite healthy he was the age of seventy.

A. when; at

B. because; in

C. if; for

D. though; at

答案：

A. when; at

B. because; in

C. if; for

(答案→)D. though; at

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