The proper tenses used to describe the background of an English abstract could be___. A、 present tense B、 present perfect tense C、 past tense D、 future tense
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高一英语present-perfect-continuous-tense(201911整理)1__H_a_v_e_you_s_ee_n__mypen?Yes,Is_a_w___itonyourdeskjustnow.(see)2_H__a_v_eyou_h_a_d__dinner?Yes,Ih_a_d__itwithMary.(have)3_D__id___thepostman_c_o_m__ethismorning?(come)4Ih__a_v_e_k_n_o_w__n_himfor...
A. present tense B. past tense C. present perfect D. present progressive 查看完整题目与答案 下列属于机翼结构设计中的方案设计的是 A. 确定设计分离面、选择结构形式、布置主要受力构件和内部空间、绘制机翼理论图 B. 内部系统的协调,设计主要受力构件、绘制机翼协调图、初步计算及打样图 C. ...
英语语法术语英汉互译主语从句subject clause 语法grammar 句法syntax ['sɪntæks]词法morphology [mɔː'fɒlədʒi]结构structure 层次rank 句子sentence 从句clause 词组phrase 词类part of speech 单词word 实词notional word 虚词structural word 单纯词simple word 派生词derivative [dɪ'rɪvə...
B. past tense C. present perfect D. present progressive 查看完整题目与答案 下列属于机翼结构设计中的方案设计的是 A. 确定设计分离面、选择结构形式、布置主要受力构件和内部空间、绘制机翼理论图 B. 内部系统的协调,设计主要受力构件、绘制机翼协调图、初步计算及打样图 C. 完成机...