问题

_naturally by the skin when exposed to sunlight, Vitamin D is needed for healthy bones, teeth and muscles.

A:Making
B:To make
C:Made
D:Make;

正确答案是：

同类题型

My mom works as a teacher and she likes her students very much.- ________ great job it is! You know, being a teacher is my dream.

What’s this in English______ a jacket.

You can trust them because they never_______ lies.

Would you like to do some shopping with us after school — __________ . But I have too much work to do.

Tom graduated and got his degree in Business management. — .