To do and并列后接do还是to do?If we want to learn English well,it is useful____ before class and____after class.A.to review;previewB.to preview;reviewC.review;to preview;D.to preview;to review

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To do and并列后接do还是to do?If we want to learn English well,it is useful____ before class and____after class.A.to review;previewB.to preview;reviewC.review;to preview;D.to preview;to review

To do and并列后接do还是to do?If we want to learn English well,it is useful____ before class and____after class.A.to review;previewB.to preview;reviewC.review;to preview;D.to preview;to review
To do and并列后接do还是to do?
If we want to learn English well,it is useful____ before class and____after class.
A.to review;preview
B.to preview;review
C.review;to preview;
D.to preview;to review

To do and并列后接do还是to do?If we want to learn English well,it is useful____ before class and____after class.A.to review;previewB.to preview;reviewC.review;to preview;D.to preview;to review
B,根据语意先排除AC,it isuseful to do sth,并列省掉后面一个to

这边do就可以了

并列后接do
选B

and 连接的前后都一样