John __ sure that he ____good at chemistry soon.

问题描述:

John __ sure that he ____good at chemistry soon.
A be ..will be B is ..would be C was..will be D was ..would be

D能够详解每个选项吗?此题主要考察主从句谓语动词时态一致的用法,即如果主句是一般现在时,则从句应使用一般现在时;如果主句动词为一般过去式,则从句也应使用一般过去式。希望上述解释能帮助到你!