9．The discovery ______ a major effect on the treatment of heart disease．（　�。�
A．is going to haveB．is to have
C．Used to haveD．has to have

分析 這項發(fā)現(xiàn)可能在對心臟病的治療上起重要的影響．

解答 答案：B，used to do表示"過去常常做某事"，have to表示"不得不"，意思與題干不符，先排除，A be going to表示"將要發(fā)生或打算進(jìn)行的動作"，B be to do表示"事先商定、安排或準(zhǔn)備要做的事情，也可表示一種可能性"，根據(jù)題干"這項發(fā)現(xiàn)對心臟病的治療只是將來可能起重要的作用"，故答案為B．

點(diǎn)評 考查短語的辨析，要掌握意思相近短語的區(qū)別．

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