We couldn’t see the road clearly the heavy snow.A. becauseB. because ofC. soD. though

问题补充：

We couldn’t see the road clearly the heavy snow.

A. because

B. because of

C. so

D. though

答案：

A. because

(答案→)B. because of

C. so

D. though

解析：句意：由于大雪我们看不清路面。Because为连词后面跟句子，because of为介词短语，后面跟名词、名词短语或代词；so表示所以，后面也跟句子，though转折连词，后面也跟句子。根据下文the heavy snow可知为名词短语，故选B。