题文
—Look at these tracks．It __________ be a wolf．
—It needn't be．It be a fox．
| A．must ; could | B．may ; might |
| C．need ; must | D．could ; need |
推荐试卷
—Look at these tracks．It __________ be a wolf．
—It needn't be．It be a fox．
| A．must ; could | B．may ; might |
| C．need ; must | D．could ; need |
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