The sign "No Smoking" in the subway means passengers ____________ smoke.
A. |
can |
B. |
should |
C. |
mustn't |
D. |
needn't |
The sign "No Smoking" in the subway means passengers ____________ smoke.
A. |
can |
B. |
should |
C. |
mustn't |
D. |
needn't |