The biggest challenge we all face is to prevent further environmental disasters. We ________ take action before it is too late.
| A． |
can |
B． |
must |
C． |
may |
D． |
might |
相关试题
—This will be my＿＿＿＿＿visit to the Great Wall. I’m really excited.
—Really? I can’t believe you’ve never been there yet. You arrived in Beijing almost a year ago!
| A． | first |
B． | second |
C． | third |
D． | fourth |
We can see the toy bear＿＿＿＿＿in the picture.
| A． | in the box |
B． | on the bed |
C． | beside the shelf |
D． | under the table |
These are my cousins. ＿＿＿＿＿are both university students.
| A． | We |
B． | You |
C． | I |
D． | They |
The＿＿＿＿＿rang and Pat answered it. It was his son calling from New York.
| A． | telephone |
B． | doorbell |
C． | clock |
D． | bike |
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