问题

The children _______ a PE classon the playground when it suddenly began to rain.

A:have
B: are having
C:had
D:were having

正确答案是：

同类题型

acertain doubt among the people as to the practical value of the project.

Max, do you have_______

Paul is friendly to us.He always___good solutions to our problems.

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Professor Smith, along with his assistant, ________on the project day and night to meet the deadline.