These two houses are similar they both have a large garden with many kinds of flowers. A.

问题补充：

These two houses are similar they both have a large garden with many kinds of flowers.

A. to that

B. in which

C. in that

D. to which

答案：

A. to that

B. in which

(答案→)C. in that

D. to which

解析：考查介词与形容词的搭配。be similar in在某方面相似。that引导的从句作介词in的宾语。