Mark the letter A, B, C or D on...

Câu hỏi: Mark the letter A, B, C or D on your answer sheet to indicate the underlined part that needs correction in each on the following questions.
In a restaurant, if we want to call the waiter, we can raise our hand and wave it slight to signal that we need assistance.

A. slight to signal

B.  if we

C.  assistance

D.  wave it