[ Past Perfect or Past Perfect Continuous ]
When they received the message, they ________ for half an hour.
A. had been studying
B. had studied
C. had study
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Grammar › ViewRecently, a new vaccine against measles __________.
A. has been developed
B. had been developed
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Which sentence uses a modal verb to express a conditional possibility?
A. If it rains, we might stay indoors.
B. If it rains, we must stay indoors.
C. If it rains, we will stay indoors.
D. If it rains, we should stay indoors.
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A. go
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When my brother _____ he wants to be a football player
A. grow
B. grow up
C. bring up
D. grows up