－When I first got to Harvard, my terrible English was a burden to me.
－Oh, dear, it ________ a struggle for you to keep up with other students.
－Oh, dear, it ________ a struggle for you to keep up with other students.
| A．might be | B．can be |
| C．should have been | D．must have been |
更新时间：2016-11-26 06:28:01
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