[ Grammar ]
I’ll check my emails …… I arrive at the office.
A. while
B. as soon as
C. by the time
D. by

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Tenses › ViewChinese merchants ____ trade in Tibet since 1950, when China ____ the country.
A. dominate / was invading
B. dominated / invaded
C. were dominating / has invaded
D. have dominated / invaded
Grammar › View
________circumstances should you call me after midnight.
A. On
B. Under
C. Under no
D. On no
Grammar › ViewThe predicate of a sentence is what the subject of the sentence is doing.
A. TRUE
B. FALSE
Relative Pronoun › View
The river … flows in my village is long. The correct relative pronoun to complete the sentence is …
A. a. who
B. b. which
C. c. which is
D. d. whom
