Some place names in the USA are __ to pronounce and to spell because they are of Indian origin.
A. both difficult B.difficult both
为什么选B不选A
请说理由 谢谢
參考答案:其实这句话的主句是Some place names in the USA are difficult to pronounce and to spell because they are of Indian origin.
both是用来说明pronounce and spell是一样难的。