They want to know .........they can do to help ú.
A.by what
B.what
C.how
D.how often

Question

They want to know .........they can do to help ú.

A.by what

B.what

C.how

D.how often

josefin · Answer

want to know sth: biết biết gì đó ...
--> They want to know what they can do to help us.
They can do .... --> what được dùng để thay thế cả cụm đó.

They want to know .........they can do to help ú.A.by whatB.whatC.howD.how often