The medicine （） cool, clean and dry.
A: must keep
B: must be kept
C: must be keep
D: must be i
A: must keep
B: must be kept
C: must be keep
D: must be i
举一反三
- Themedicine（）cool,cleananddry. A: must keep B: must be kept C: must be keep D: must be in
- Food ___in a cool place in summer. A: must keep B: mustn't keep C: must be kept D: mustn't be kept
- The classroom must ______. A: be kept clean B: keep cleaned C: kept clean
- Our room must ( ) clean. A: to keep B: be keeping C: be kept D: keep
- Sorry, I’m late. I ____________you waiting. A: should not keep B: should not have kept C: should have kept D: must not have kept