Was it when he returned he was caught in a snowstorm?A. whereB. when C. thatD. how

问题补充：

Was it when he returned he was caught in a snowstorm?

A. where

B. when

C. that

D. how

答案：

A. where

B. when

(答案→)C. that

D. how

解析：考查强调句型。强调句型的基本结构：it is/was被强调成分that/who其它成分；去掉it is/was…that/who..句中仍然是成立的。句意：是在他回来的时候，他遭遇了暴风雪了。