英语问题

Question

____Mathematics is the base of all other sciences.
a.This is because
b.This is that
c.It is that
d.Because
选哪个？为什么？

Answer 1

答案是a，because后面是一个表语从句，
如果用b，c则主句的句子成分就不完整，
用d，则不成为句子了。

Answer 2

__A__Mathematics is the base of all other sciences.
a.This is because
b.This is that
c.It is that
d.Because
This is because /why.是固定结构。在这是表原因。所以用This is because 。
明了吧。

Answer 3

A
（This is because）Mathematics is the base of all other sciences.这是因为数学是其他科学的基础。
This is because是固定句型，表示：这是什么什么的原因。

Answer 4

a.This is because Mathematics is the base of all other sciences.
这是一个完整的句子。

b.This is that，c.It is that 不符合句子意思。
d.Because 不是一个完整的句子，只是一个从句，不单独使用。本回答被提问者采纳