That sentence was hard to understand, so I had to have my teacher______it for me.

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问题 That sentence was hard to understand, so I had to have my teacher______it for me.

选项 A、to explain
B、explain
C、explaining
D、to be explaining

答案B

解析 这里的have是使役动词,后面要求跟不带to的不定式复合结构作宾语,相当于make sb do sth。have sb doing sth强调的是动作进行中的状态。
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