(单选题)

—Will it be sunny tomorrow? We are going to have a picnic in the park.
—Who knows? It ______fine. The weather always changes quickly.

A.must be

B.will be

C.may be

D.maybe

参考答案：C

参考解析：

考查情态动词表推测。句意：“明天会是晴天吗？我们要去公园野餐。”“谁知道呢？肯会是晴天。天气总是变得非常快。”根据语境可知，这里表对将来的猜测，根据“Who knows?”可知语气较弱，所以用may，意为“可能”。must表示猜测的语气非常强，意为“一定”；will be意为“将会”，不用于猜测；maybe是副词，意为“也许、大概”，不符合语法规则。故选C。

知识点：

—Will it be sunny tomorrow? We are going to have a picnic in the park.—Who knows? It ______fine. The weather always changes quickly.

—Will it be sunny tomorrow? We are going to have a picnic in the park.
—Who knows? It ______fine. The weather always changes quickly.