I ____ carefully before I gave the presentation about the impacts of natural disasters.
A. had prepared B. prepare
C. has prepared D. prepared

Question

I ____ carefully before I gave the presentation about the impacts of natural disasters.             A. had prepared         B. prepare                  C. has prepared         D. prepared

cobexinhdep · Answer

Giải đáp: A (Cấu tr&uacute;c: QKHT+ before + QKĐ    QKHT: had + PII)

dantam45 · Answer

...had prepared ...   Giải th&iacute;ch:  Sử dụng  have  trong trường hợp n&agrave;y v&igrave; đ&acirc;y l&agrave; một sự việc xảy ra v&agrave; c&oacute; một sự việc kh&aacute;c xen v&agrave;o. V&igrave; đ&acirc;y l&agrave; trong qu&aacute; khứ, n&ecirc;n  have  th&agrave;nh  had .  Cấu tr&uacute;c c&acirc;u:   have/had + V2/V-ed   ( VD:  'I've not finished the homework yet.)

I ____ carefully before I gave the presentation about the impacts of natural disasters. A. had prepared B

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