摘要：12．--This wall of air is an effective answer to the problem and it work． --But it is a question to put such a wall of air around the statue． A．may B．must C．should D．could
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---This wall of air is an effective answer to the problem and it ________ work．
---But it is a question to put such a wall of air around the statue．
- A.may
- B.must
- C.should
- D.could
30. —This wall of air is an effective answer to the problem and it ______ work.
—But it is a question to put such a wall of air around the statue.
| A．may | B．must | C．should | D．Could |
—This wall of air is an effective answer to the problem and it ______ work.
—But it is a question to put such a wall of air around the statue.
| A．may | B．must | C．should | D．could |