Question

If you want to join us,you _______ help kids with their schoolwork

A.would B.have to C.could D.should
有没有理由啊同志们,

Answer 1

感觉是D。 后半句的语境在先更合理一些。因为前半句有want to

你想要加入我们的话，你应该（先）。。。

Answer 2

I'm pretty sure the answer is C. you could help kids, it is polite and suggesting means you can help kids with their schoolwork.
B and D are requesting, means must, we can eliminate those two. A-would means will, which does not fit in this sentence.

Answer 3

应该选“A”希望可以帮到您`(*∩_∩*)′~~~~

Answer 4

D.should 应该