解释几个英语语法问题，回答的好追分

不要只讲语法点,最好讲下区别
1.(D)left before the deadline for the task,Tom doesn't look worried at all.
A.Though such a short time
B.Even though such a short time
C.With such a short time
D.Despite such a short time
2.Tom made(A)a rule to do morning exercise every day.
A.it
B.this
C./
D.that
3.(C)they were sure to help us made us deeply moved.
A.What
B./
C.That
D.Whether
4.He acted (A)he had ever lived in China before.
A.as though
B.even if
C.as
D.since

A.
B.
C.
D.

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