Question

【题目】—What Mary and Lucy ?—They are playing the guitar.
A.do; do
B.are; do
C.are; doing
D.does; do

Answer 1

【答案】C
【解析】答句 They are playing the guitar.用了现在进行时，可以推断问句的意思是“玛丽和露丝正在干什么？”，也需要用现在进行时，故选C。