It's necessary____ masks（口罩） in public places during the COVID﹣19 period．（ ）
| A． |
for us to wear |
B． |
for us wearing |
| C． |
of us wearing |
D． |
of us to wear |
It's necessary____ masks（口罩） in public places during the COVID﹣19 period．（ ）
| A． |
for us to wear |
B． |
for us wearing |
| C． |
of us wearing |
D． |
of us to wear |
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