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【单选题】
John and Emma ____ the doctor. Their son is very sick.
A.
has to call
B.
have to call
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参考答案：
参考解析：
刷刷题刷刷变学霸
举一反三
【单选题】You should exercise three or four times a week. You ___ exercise every day.
A.
don't have to
B.
have to
【单选题】Anna ___ learn how to manage her schedule. She doesn't manage it very well.
A.
has to
B.
have to