He let a week ( ) by before ( ) the letter.选A对的吗?求教,A.to go; answer B.go; answering C.to go; to answer D.go; to answer

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He let a week ( ) by before ( ) the letter.选A对的吗?求教,A.to go; answer B.go; answering C.to go; to answer D.go; to answer

He let a week ( ) by before ( ) the letter.选A对的吗?求教,A.to go; answer B.go; answering C.to go; to answer D.go; to answer
He let a week ( ) by before ( ) the letter.选A对的吗?求教,
A.to go; answer B.go; answering C.to go; to answer D.go; to answer

He let a week ( ) by before ( ) the letter.选A对的吗?求教,A.to go; answer B.go; answering C.to go; to answer D.go; to answer
B
let是使役动词,后面的宾补用动词原形,排除A和C.before是介词,其宾语用动名词,不定式不能作介词的宾语,排除D.

B. go; answering let...do 固定结构 before 做介词 后接动名词