题文
-Where did you get this book?
-I picked it up from a second-hand bookshop if you __________ know.
| A．must |
| B．will |
| C．can |
| D．shall |
推荐试卷
-Where did you get this book?
-I picked it up from a second-hand bookshop if you __________ know.
| A．must |
| B．will |
| C．can |
| D．shall |
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