You can think of many casesChinese students obviously know a lot of English words and expr

问题补充：

You can think of many casesChinese students obviously know a lot of English words and expressions but can’t express themselves freely.

A. when.

B. which.

C. as.

D. where

答案：

A. when.

B. which.

C. as.

(答案→)D. where

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