问题

It has been announced that all the students ____ put on masks before going to school in case they are infected with SARS virus.

A:shall
B:will
C:need
D:may

正确答案是：

同类题型

下列划线词，古今意义完全相同的一项是（）

o Chinese scientists have made a wonderfuldiscovery, which marks a major _______ in the basic research in the field.

him __ there, __ his clothes and jumpinto the river

My friend Lisa is good at all the subjects at school, ________English.

Would you like ________ ice cream now