他们一定挺忙的,因为他们必须准备考试。
A.They must be very busy, as they have to prepare for the test. B.They must be very busy, as they have to prepare the test. C.They should be very busy, as they have to prepare the test.正确答案A
他们一定挺忙的,因为他们必须准备考试。
A.They must be very busy, as they have to prepare for the test. B.They must be very busy, as they have to prepare the test. C.They should be very busy, as they have to prepare the test.正确答案A
