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急1.I have a lot of trouble ___ scienceA.learn B.to learn C.l

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1.I have a lot of trouble ___ science
A.learn B.to learn C.learing D.learns
2.You'd better keep sending the __ message to your parents.
A.late B.later C.latest D.earliest
急1.I have a lot of trouble ___ scienceA.learn B.to learn C.l
C.learning ;
have trouble doing sth;做某事有麻烦;
C.latest:最新的,最近的;
你应该不间断的向你的父母亲报告你的最新情况