【題目】一 I must finish the work before I leave.
一 Please tell me if you need my help.
A.may
B.have to
C.should

【答案】B
【解析】may 可能，have to 必須，不得不，should 應該，句意是：—我必須在我離開之前完成工作�！绻阈枰�?guī)椭臅r候請告訴我。

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