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【单选题】

You _______ study hard if you want to get good grades in English.

[ ]

A.
can
B.
may
C.
must
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参考答案:
参考解析:
.
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举一反三

【单选题】—Did you go to Ann's birthday party?—No, I __________. [ ]

A.
didn't invite
B.
wasn't inviting
C.
hadn't invited
D.
wasn't invited