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.
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.
举一反三
- She is very busy ( ) for a journey. A: prepare B: to prepare C: preparing D: to be preparing
- I have to prepare _____ a test. A: to B: at C: of D: fo
- The English test last Friday very difficult since most of the students failed. A: must have been B: would be C: would have been D: should be
- If you __________ (prepare)for the test, you would have passed it.
- To have a skin test can be _________, but not very painful.